feat(erp): 采购台账改造与采购退货增强

gaoluyang

10 天以前 70ea74cfb981f812bfa4e3ef91843c5ad93f7b27

 yudao-module-mes/src/main/java/cn/iocoder/yudao/module/mes/service/wm/returnvendor/MesWmReturnVendorServiceImpl.java

@@ -2,29 +2,49 @@

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import cn.iocoder.yudao.framework.common.exception.ServiceException;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.collection.CollectionUtils;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.framework.common.util.object.ObjectUtils;
import cn.iocoder.yudao.module.bpm.api.task.BpmProcessInstanceApi;
import cn.iocoder.yudao.module.bpm.api.task.dto.BpmProcessInstanceCreateReqDTO;
import cn.iocoder.yudao.module.mes.controller.admin.wm.returnvendor.vo.MesWmReturnVendorPageReqVO;
import cn.iocoder.yudao.module.mes.controller.admin.wm.returnvendor.vo.MesWmReturnVendorSaveReqVO;
import cn.iocoder.yudao.module.mes.controller.admin.wm.returnvendor.vo.line.MesWmReturnVendorLineSaveReqVO;
import cn.iocoder.yudao.module.mes.dal.dataobject.wm.returnvendor.MesWmReturnVendorDO;
import cn.iocoder.yudao.module.mes.dal.dataobject.wm.returnvendor.MesWmReturnVendorDetailDO;
import cn.iocoder.yudao.module.mes.dal.dataobject.wm.returnvendor.MesWmReturnVendorLineDO;
import cn.iocoder.yudao.module.mes.dal.mysql.wm.returnvendor.MesWmReturnVendorMapper;
import cn.iocoder.yudao.module.mes.enums.MesBizTypeConstants;
import cn.iocoder.yudao.module.mes.enums.wm.MesWmReturnVendorHandleTypeEnum;
import cn.iocoder.yudao.module.mes.enums.wm.MesWmReturnVendorStatusEnum;
import cn.iocoder.yudao.module.mes.enums.wm.MesWmTransactionTypeEnum;
import cn.iocoder.yudao.module.erp.api.finance.ErpFinancePaymentApi;
import cn.iocoder.yudao.module.erp.api.finance.dto.ErpFinancePaymentRedFlushCreateReqDTO;
import cn.iocoder.yudao.module.erp.api.purchase.ErpPurchaseOrderApi;
import cn.iocoder.yudao.module.erp.api.purchase.dto.ErpPurchaseOrderItemRespDTO;
import cn.iocoder.yudao.module.erp.api.purchase.dto.ErpPurchaseOrderRespDTO;
import cn.iocoder.yudao.module.srm.api.supplier.SrmSupplierApi;
import cn.iocoder.yudao.module.mes.service.wm.arrivalnotice.MesWmArrivalNoticeService;
import cn.iocoder.yudao.module.mes.service.wm.transaction.MesWmTransactionService;
import cn.iocoder.yudao.module.mes.service.wm.transaction.dto.MesWmTransactionSaveReqDTO;
import cn.iocoder.yudao.module.system.api.storage.StorageAttachmentApi;
import jakarta.annotation.Resource;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertList;
@@ -37,6 +57,11 @@
@Validated
public class MesWmReturnVendorServiceImpl implements MesWmReturnVendorService {

    /**
     * 附件业务类型：MES 供应商退货单
     */
    public static final String RETURN_VENDOR_RECORD_TYPE = "mes_wm_return_vendor";

    @Resource
    private MesWmReturnVendorMapper returnVendorMapper;

@@ -48,29 +73,86 @@
    private SrmSupplierApi srmSupplierApi;
    @Resource
    private MesWmTransactionService wmTransactionService;
    @Resource
    private ErpPurchaseOrderApi purchaseOrderApi;
    @Resource
    private ErpFinancePaymentApi financePaymentApi;
    @Resource
    private MesWmArrivalNoticeService arrivalNoticeService;
    @Resource
    private StorageAttachmentApi storageAttachmentApi;
    @Resource
    private BpmProcessInstanceApi processInstanceApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createReturnVendor(MesWmReturnVendorSaveReqVO createReqVO) {
        // 1. 校验数据
        validateReturnVendorSaveData(createReqVO);
        // 1.1. 若采购订单号为空但关联了采购订单，则从 ERP 采购订单补齐订单号、合同号
        fillFromPurchaseOrder(createReqVO);

        // 2. 插入主表
        MesWmReturnVendorDO returnVendor = BeanUtils.toBean(createReqVO, MesWmReturnVendorDO.class);
        returnVendor.setStatus(MesWmReturnVendorStatusEnum.PREPARE.getStatus());
        returnVendorMapper.insert(returnVendor);

        // 2.1. 关联了采购订单：自动把订单物料带入退货行（无可退物料时静默，不影响单据创建）
        if (returnVendor.getPurchaseOrderId() != null) {
            autoImportLinesFromLinkedOrder(returnVendor.getId(), false);
        }
        // 2.2. 绑定附件（质量部发起退货时上传的检验报告、照片等）
        storageAttachmentApi.bindAttachments("file", RETURN_VENDOR_RECORD_TYPE,
                returnVendor.getId(), createReqVO.getBlobIds());
        return returnVendor.getId();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateReturnVendor(MesWmReturnVendorSaveReqVO updateReqVO) {
        // 1. 校验数据
        validateReturnVendorSaveData(updateReqVO);
        // 1. 校验数据（含存在 + 草稿状态）
        MesWmReturnVendorDO oldReturnVendor = validateReturnVendorSaveData(updateReqVO);
        // 1.1. 若采购订单号为空但关联了采购订单，则从 ERP 采购订单补齐订单号、合同号
        fillFromPurchaseOrder(updateReqVO);

        Long oldPurchaseOrderId = oldReturnVendor != null ? oldReturnVendor.getPurchaseOrderId() : null;
        Long newPurchaseOrderId = updateReqVO.getPurchaseOrderId();
        boolean purchaseOrderChanged = !ObjUtil.equal(oldPurchaseOrderId, newPurchaseOrderId);

        // 2. 更新主表
        MesWmReturnVendorDO updateObj = BeanUtils.toBean(updateReqVO, MesWmReturnVendorDO.class);
        returnVendorMapper.updateById(updateObj);

        // 3. 关联了采购订单：自动同步物料行，保证行物料与该采购订单一致
        //    3.1 更换了采购订单 → 先清空旧订单带入的行，再按新订单重新带入
        //    3.2 采购订单未变但当前无行 → 兜底自动带入（历史数据或带料被中断的场景）
        if (newPurchaseOrderId != null) {
            autoImportLinesFromLinkedOrder(updateReqVO.getId(), purchaseOrderChanged);
        }

        // 4. 增量更新附件（只处理新增/删除，未传 blobIds 时不动现有附件）
        storageAttachmentApi.updateAttachments("file", RETURN_VENDOR_RECORD_TYPE,
                updateReqVO.getId(), updateReqVO.getBlobIds());
    }

    /**
     * 关联了采购订单时，从 ERP 采购订单补齐采购订单号、合同号（合同号只做快照，不允许手工生成）
     */
    private void fillFromPurchaseOrder(MesWmReturnVendorSaveReqVO reqVO) {
        if (reqVO == null || reqVO.getPurchaseOrderId() == null) {
            return;
        }
        ErpPurchaseOrderRespDTO purchaseOrder =
                purchaseOrderApi.getPurchaseOrder(reqVO.getPurchaseOrderId()).getCheckedData();
        if (purchaseOrder == null) {
            return;
        }
        if (StrUtil.isBlank(reqVO.getPurchaseOrderCode())) {
            reqVO.setPurchaseOrderCode(purchaseOrder.getNo());
        }
        if (StrUtil.isBlank(reqVO.getContractNo())) {
            reqVO.setContractNo(purchaseOrder.getContractNo());
        }
    }

    @Override
@@ -83,7 +165,9 @@
        returnVendorDetailService.deleteReturnVendorDetailByReturnId(id);
        // 2.2 级联删除行
        returnVendorLineService.deleteReturnVendorLineByReturnId(id);
        // 2.3 删除主表
        // 2.3 删除附件
        storageAttachmentApi.deleteAttachmentsByRecord(RETURN_VENDOR_RECORD_TYPE, id);
        // 2.4 删除主表
        returnVendorMapper.deleteById(id);
    }

@@ -115,6 +199,80 @@

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitReturnVendorApproval(Long id, String processDefinitionKey) {
        // 1. 校验存在 + 草稿状态 + 至少一条行
        validateReturnVendorExistsAndPrepare(id);
        if (CollUtil.isEmpty(returnVendorLineService.getReturnVendorLineListByReturnId(id))) {
            throw exception(WM_RETURN_VENDOR_NO_LINE);
        }

        // 2. 全局免审批：直接置为「待拣货」，无需流程模型
        if (processInstanceApi.isGlobalAutoApprove()) {
            returnVendorMapper.updateById(new MesWmReturnVendorDO()
                    .setId(id)
                    .setStatus(MesWmReturnVendorStatusEnum.APPROVING.getStatus())
                    .setProcessDefinitionKey(processDefinitionKey)
                    .setProcessInstanceId(""));
            return;
        }

        // 3. 创建 BPM 流程实例；流程未发布时给出明确提示
        String processInstanceId;
        try {
            processInstanceId = processInstanceApi.createProcessInstance(getCurrentUserId(),
                    new BpmProcessInstanceCreateReqDTO()
                            .setProcessDefinitionKey(processDefinitionKey)
                            .setBusinessKey(String.valueOf(id)));
        } catch (ServiceException ex) {
            if (cn.iocoder.yudao.module.bpm.enums.ErrorCodeConstants.PROCESS_DEFINITION_NOT_EXISTS
                    .getCode().equals(ex.getCode())) {
                throw exception(WM_RETURN_VENDOR_APPROVE_PROCESS_NOT_PUBLISHED, processDefinitionKey);
            }
            throw ex;
        }

        // 4. 更新退货单状态为审批中
        returnVendorMapper.updateById(new MesWmReturnVendorDO()
                .setId(id)
                .setStatus(MesWmReturnVendorStatusEnum.BPM_APPROVING.getStatus())
                .setProcessDefinitionKey(processDefinitionKey)
                .setProcessInstanceId(processInstanceId));
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateReturnVendorAuditStatus(Long id, Integer bpmResult) {
        // 1. 校验存在 + 审批中
        MesWmReturnVendorDO returnVendor = validateReturnVendorExists(id);
        if (!MesWmReturnVendorStatusEnum.BPM_APPROVING.getStatus().equals(returnVendor.getStatus())) {
            return;
        }

        // 2. 根据审批结果更新状态：通过 -> 待拣货；驳回 -> 草稿；取消 -> 已取消
        Integer newStatus = convertBpmResultToReturnVendorStatus(bpmResult);
        if (newStatus != null) {
            returnVendorMapper.updateById(new MesWmReturnVendorDO().setId(id).setStatus(newStatus));
        }
    }

    /**
     * 转换 BPM 审批结果为供应商退货单状态
     */
    private Integer convertBpmResultToReturnVendorStatus(Integer bpmResult) {
        if (cn.iocoder.yudao.module.bpm.enums.task.BpmProcessInstanceStatusEnum.APPROVE.getStatus().equals(bpmResult)) {
            return MesWmReturnVendorStatusEnum.APPROVING.getStatus();
        }
        if (cn.iocoder.yudao.module.bpm.enums.task.BpmProcessInstanceStatusEnum.REJECT.getStatus().equals(bpmResult)) {
            return MesWmReturnVendorStatusEnum.PREPARE.getStatus();
        }
        if (cn.iocoder.yudao.module.bpm.enums.task.BpmProcessInstanceStatusEnum.CANCEL.getStatus().equals(bpmResult)) {
            return MesWmReturnVendorStatusEnum.CANCELED.getStatus();
        }
        return null;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void stockReturnVendor(Long id) {
        // 校验存在
        MesWmReturnVendorDO returnVendor = validateReturnVendorExists(id);
@@ -140,12 +298,184 @@
            throw exception(WM_RETURN_VENDOR_NO_DETAIL);
        }

        // 1.3 校验处理方式（退款 / 换货）
        if (!MesWmReturnVendorHandleTypeEnum.isValid(returnVendor.getHandleType())) {
            throw exception(WM_RETURN_VENDOR_HANDLE_TYPE_INVALID, returnVendor.getHandleType());
        }

        // 2. 遍历所有明细，创建库存事务（扣减库存 + 记录流水）
        createTransactionList(returnVendor, details);

        // 3. 更新退货单状态
        // 3. 回写采购订单行的已退货数量（按物料匹配采购订单明细）
        writeBackPurchaseOrderReturnCount(returnVendor);

        // 4. 先置为已完成，保证重复调用会被状态校验拦截（幂等）
        returnVendorMapper.updateById(new MesWmReturnVendorDO()
                .setId(id).setStatus(MesWmReturnVendorStatusEnum.FINISHED.getStatus()));

        // 5. 费用处理：退款 -> 负数冲红付款单；换货 -> 换货到货通知单（重新入库 + 重新质检）
        if (MesWmReturnVendorHandleTypeEnum.REFUND.getType().equals(returnVendor.getHandleType())) {
            createRedFlushPayment(id);
        } else if (MesWmReturnVendorHandleTypeEnum.REPLACEMENT.getType().equals(returnVendor.getHandleType())) {
            createReplacementNotice(id);
        }
    }

    /**
     * 把退货数量增量回写到关联采购订单的明细行，并同步订单级退货数量
     */
    private void writeBackPurchaseOrderReturnCount(MesWmReturnVendorDO returnVendor) {
        if (returnVendor.getPurchaseOrderId() == null) {
            return;
        }
        List<MesWmReturnVendorLineDO> lines = returnVendorLineService.getReturnVendorLineListByReturnId(returnVendor.getId());
        if (CollUtil.isEmpty(lines)) {
            return;
        }
        List<ErpPurchaseOrderItemRespDTO> orderItems = purchaseOrderApi
                .getPurchaseOrderItemList(returnVendor.getPurchaseOrderId()).getCheckedData();
        if (CollUtil.isEmpty(orderItems)) {
            return;
        }
        Map<Long, Long> purchaseOrderItemIdMap = new HashMap<>();
        orderItems.stream()
                .filter(item -> item.getProductId() != null)
                .forEach(item -> purchaseOrderItemIdMap.putIfAbsent(item.getProductId(), item.getId()));
        for (MesWmReturnVendorLineDO line : lines) {
            Long purchaseOrderItemId = purchaseOrderItemIdMap.get(line.getItemId());
            if (purchaseOrderItemId == null || line.getQuantity() == null) {
                continue;
            }
            purchaseOrderApi.updateOrderItemReturnCount(purchaseOrderItemId, line.getQuantity());
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createRedFlushPayment(Long id) {
        // 1. 校验存在 + 已完成 + 处理方式为退款
        MesWmReturnVendorDO returnVendor = validateReturnVendorFinished(id);
        if (!MesWmReturnVendorHandleTypeEnum.REFUND.getType().equals(returnVendor.getHandleType())) {
            throw exception(WM_RETURN_VENDOR_HANDLE_TYPE_INVALID, returnVendor.getHandleType());
        }
        // 2. 幂等：已生成过冲红单直接返回
        if (returnVendor.getRedFlushPaymentId() != null) {
            return returnVendor.getRedFlushPaymentId();
        }
        // 3. 计算退款金额（未填写时按采购单价 × 退货数量）
        BigDecimal refundAmount = resolveRefundAmount(returnVendor);

        // 4. 生成负数冲红付款单
        Long paymentId = financePaymentApi.createRedFlushPayment(new ErpFinancePaymentRedFlushCreateReqDTO()
                .setSupplierId(returnVendor.getVendorId())
                .setRefundAmount(refundAmount)
                .setSourceId(returnVendor.getId())
                .setSourceNo(returnVendor.getCode())
                .setFinanceUserId(getCurrentUserId())
                .setRemark("供应商退货单[" + returnVendor.getCode() + "]退款冲红，合同号[" + returnVendor.getContractNo() + "]"))
                .getCheckedData();

        // 5. 回写冲红单号与最终退款金额
        returnVendorMapper.updateById(new MesWmReturnVendorDO()
                .setId(id).setRefundAmount(refundAmount).setRedFlushPaymentId(paymentId));
        return paymentId;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createReplacementNotice(Long id) {
        // 1. 校验存在 + 已完成 + 处理方式为换货
        MesWmReturnVendorDO returnVendor = validateReturnVendorFinished(id);
        if (!MesWmReturnVendorHandleTypeEnum.REPLACEMENT.getType().equals(returnVendor.getHandleType())) {
            throw exception(WM_RETURN_VENDOR_HANDLE_TYPE_INVALID, returnVendor.getHandleType());
        }
        // 2. 幂等：已生成过换货到货单直接返回
        if (returnVendor.getReplacementNoticeId() != null) {
            return returnVendor.getReplacementNoticeId();
        }

        // 3. 生成换货到货通知单（待质检，行自动创建 IQC）
        Long noticeId = arrivalNoticeService.createReplacementArrivalNotice(id);

        // 4. 回写到货通知单编号
        returnVendorMapper.updateById(new MesWmReturnVendorDO()
                .setId(id).setReplacementNoticeId(noticeId));
        return noticeId;
    }

    /**
     * 解析退款金额：优先取单据填写值；未填写时按「采购单价 × 退货数量」逐行累加
     */
    private BigDecimal resolveRefundAmount(MesWmReturnVendorDO returnVendor) {
        if (returnVendor.getRefundAmount() != null
                && returnVendor.getRefundAmount().compareTo(BigDecimal.ZERO) > 0) {
            return returnVendor.getRefundAmount();
        }
        if (returnVendor.getPurchaseOrderId() == null) {
            throw exception(WM_RETURN_VENDOR_REFUND_AMOUNT_REQUIRED,
                    returnVendor.getCode(), "未关联采购订单");
        }
        List<ErpPurchaseOrderItemRespDTO> orderItems = purchaseOrderApi
                .getPurchaseOrderItemList(returnVendor.getPurchaseOrderId()).getCheckedData();
        Map<Long, BigDecimal> priceMap = new HashMap<>();
        if (CollUtil.isNotEmpty(orderItems)) {
            orderItems.stream().filter(item -> item.getProductId() != null)
                    .forEach(item -> priceMap.putIfAbsent(item.getProductId(), item.getProductPrice()));
        }
        List<MesWmReturnVendorLineDO> lines = returnVendorLineService.getReturnVendorLineListByReturnId(returnVendor.getId());
        if (CollUtil.isEmpty(lines)) {
            throw exception(WM_RETURN_VENDOR_NO_LINE);
        }
        BigDecimal total = BigDecimal.ZERO;
        for (MesWmReturnVendorLineDO line : lines) {
            BigDecimal price = priceMap.get(line.getItemId());
            if (price == null) {
                throw exception(WM_RETURN_VENDOR_REFUND_AMOUNT_REQUIRED,
                        returnVendor.getCode(), "物料ID=" + line.getItemId() + " 未匹配到采购单价");
            }
            BigDecimal quantity = line.getQuantity() != null ? line.getQuantity() : BigDecimal.ZERO;
            total = total.add(price.multiply(quantity));
        }
        if (total.compareTo(BigDecimal.ZERO) <= 0) {
            throw exception(WM_RETURN_VENDOR_REFUND_AMOUNT_REQUIRED,
                    returnVendor.getCode(), "采购单价 × 退货数量合计为 0");
        }
        return total;
    }

    /**
     * 校验退货单存在且已完成（费用类操作仅在完成后退货单上执行）
     */
    private MesWmReturnVendorDO validateReturnVendorFinished(Long id) {
        MesWmReturnVendorDO returnVendor = validateReturnVendorExists(id);
        if (!MesWmReturnVendorStatusEnum.FINISHED.getStatus().equals(returnVendor.getStatus())) {
            throw exception(WM_RETURN_VENDOR_FINISHED_REQUIRED, returnVendor.getCode(),
                    resolveStatusName(returnVendor.getStatus()));
        }
        return returnVendor;
    }

    /**
     * 状态值转名称，解析失败回退为 ID 字符串
     */
    private String resolveStatusName(Integer status) {
        for (MesWmReturnVendorStatusEnum value : MesWmReturnVendorStatusEnum.values()) {
            if (value.getStatus().equals(status)) {
                return value.getName();
            }
        }
        return "ID=" + status;
    }

    /**
     * 获取当前用户编号（BPM 流程发起人、财务人员）
     */
    private Long getCurrentUserId() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if (authentication != null && authentication.getPrincipal() instanceof Long) {
            return (Long) authentication.getPrincipal();
        }
        return null;
    }

    private void createTransactionList(MesWmReturnVendorDO returnVendor, List<MesWmReturnVendorDetailDO> details) {
@@ -210,16 +540,50 @@

    /**
     * 校验退货单创建/修改的公共数据
     *
     * @return 修改时返回旧单据（用于比较采购订单是否变更）；创建时返回 null
     */
    private void validateReturnVendorSaveData(MesWmReturnVendorSaveReqVO reqVO) {
    private MesWmReturnVendorDO validateReturnVendorSaveData(MesWmReturnVendorSaveReqVO reqVO) {
        // 校验存在 + 草稿状态（仅修改时）
        MesWmReturnVendorDO oldReturnVendor = null;
        if (reqVO.getId() != null) {
            validateReturnVendorExistsAndPrepare(reqVO.getId());
            oldReturnVendor = validateReturnVendorExistsAndPrepare(reqVO.getId());
        }
        // 校验供应商存在
        srmSupplierApi.getSupplier(reqVO.getVendorId());
        // 校验编码唯一
        validateCodeUnique(reqVO.getId(), reqVO.getCode());
        return oldReturnVendor;
    }

    /**
     * 把关联采购订单的物料自动带入退货单行（仅草稿状态且已关联采购订单时生效）。
     *
     * @param id         退货单编号
     * @param clearFirst 是否先清空已有行再带入；更换采购订单时传 true
     */
    private void autoImportLinesFromLinkedOrder(Long id, boolean clearFirst) {
        MesWmReturnVendorDO returnVendor = returnVendorMapper.selectById(id);
        if (returnVendor == null || returnVendor.getPurchaseOrderId() == null) {
            return;
        }
        List<MesWmReturnVendorLineDO> existingLines =
                returnVendorLineService.getReturnVendorLineListByReturnId(id);
        if (clearFirst) {
            if (CollUtil.isNotEmpty(existingLines)) {
                // 级联删除旧明细与行
                returnVendorDetailService.deleteReturnVendorDetailByReturnId(id);
                returnVendorLineService.deleteReturnVendorLineByReturnId(id);
            }
        } else if (CollUtil.isNotEmpty(existingLines)) {
            // 已有行且未更换采购订单：不重复带入，避免覆盖用户已调整的数量
            return;
        }
        try {
            importPurchaseOrderItems(id);
        } catch (ServiceException ignore) {
            // 采购订单无明细 / 无可退物料等业务异常：单据主体仍正常保存，可在物料区另行处理
        }
    }

    /**
@@ -240,4 +604,53 @@
        return returnVendorMapper.selectCountByVendorId(vendorId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int importPurchaseOrderItems(Long id) {
        // 1. 校验退货单存在且为草稿状态
        MesWmReturnVendorDO returnVendor = validateReturnVendorExistsAndPrepare(id);
        if (returnVendor.getPurchaseOrderId() == null) {
            throw exception(WM_RETURN_VENDOR_PURCHASE_ORDER_REQUIRED);
        }

        // 2. 获取采购订单及明细
        ErpPurchaseOrderRespDTO purchaseOrder = purchaseOrderApi.getPurchaseOrder(returnVendor.getPurchaseOrderId()).getCheckedData();
        if (purchaseOrder == null) {
            throw exception(WM_PURCHASE_ORDER_NOT_EXISTS);
        }
        List<ErpPurchaseOrderItemRespDTO> items = purchaseOrderApi.getPurchaseOrderItemList(returnVendor.getPurchaseOrderId()).getCheckedData();
        if (CollUtil.isEmpty(items)) {
            throw exception(WM_RETURN_VENDOR_PURCHASE_ORDER_NO_ITEM);
        }

        // 3. 已存在的行物料集合（按物料去重，避免重复带入）
        Set<Long> existsItemIds = new HashSet<>();
        List<MesWmReturnVendorLineDO> existingLines = returnVendorLineService.getReturnVendorLineListByReturnId(id);
        if (CollUtil.isNotEmpty(existingLines)) {
            existsItemIds.addAll(convertList(existingLines, MesWmReturnVendorLineDO::getItemId));
        }

        // 4. 遍历采购订单明细，生成退货行（可退数量 = 已入库 - 已退货）
        int importedCount = 0;
        for (ErpPurchaseOrderItemRespDTO item : items) {
            if (item.getProductId() == null || existsItemIds.contains(item.getProductId())) {
                continue;
            }
            BigDecimal inCount = item.getInCount() != null ? item.getInCount() : BigDecimal.ZERO;
            BigDecimal returnCount = item.getReturnCount() != null ? item.getReturnCount() : BigDecimal.ZERO;
            BigDecimal quantity = inCount.subtract(returnCount);
            if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
                continue;
            }
            MesWmReturnVendorLineSaveReqVO lineReqVO = new MesWmReturnVendorLineSaveReqVO();
            lineReqVO.setReturnId(id);
            lineReqVO.setItemId(item.getProductId());
            lineReqVO.setQuantity(quantity);
            lineReqVO.setRemark(item.getRemark());
            returnVendorLineService.createReturnVendorLine(lineReqVO);
            importedCount++;
        }
        return importedCount;
    }

}