修复关联预览除以0的问题

BBWYB.Server.Business/PurchaseOrder/PurchaseOrderBusiness.cs

@@ -961,7 +961,7 @@ namespace BBWYB.Server.Business
                     OrderId = orderSku.OrderId,
                     SkuAmount = orderPurchaseSkuOfCurrentSchemeList.Sum(psku => psku.ProductAmount),
                     PurchaseQuantity = orderSku.ItemTotal.Value,
-                    PurchaseFreight = purchaseOrderSimpleInfo.FreightAmount * (orderPurchaseSkuOfCurrentSchemeList.Sum(x => x.Quantity) / totalPurchaseCount)
+                    PurchaseFreight = purchaseOrderSimpleInfo.FreightAmount * (1.0M * orderPurchaseSkuOfCurrentSchemeList.Sum(x => x.Quantity) / totalPurchaseCount)
                 };
                 assocationOrderCostDetail.PurchasePrice = assocationOrderCostDetail.SkuAmount / assocationOrderCostDetail.PurchaseFreight;
                 assocationOrderCostDetailList.Add(assocationOrderCostDetail);