fix 补差价商品特殊处理

netflix-service/src/main/java/com/cyksj/service/order/impl/OrderDonServiceImpl.java

@@ -475,8 +475,12 @@ public class OrderDonServiceImpl extends ServiceImpl<OrderDonMapper, OrderDon> i
 			throw BusinessRuntimeException.getInstance("购买数量必须大于0");
 		}
 		payRequest.setNum(quantity);
-		boolean multiQuantity = quantity > 1 && sku != null && Boolean.TRUE.equals(sku.getIsMultiQuantity());
-		if (quantity > 1 && !multiQuantity) {
+		// 补差价商品的数量表示差价金额，沿用原有的特殊下单流程，不能进入
+		// 普通多件商品的独立票券履约逻辑，也不能被普通 SKU 多件开关拦截。
+		boolean priceDifferenceOrder = goodsDon.getType() != null && goodsDon.getType() == 5;
+		boolean multiQuantity = !priceDifferenceOrder && quantity > 1 && sku != null
+				&& Boolean.TRUE.equals(sku.getIsMultiQuantity());
+		if (quantity > 1 && !priceDifferenceOrder && !multiQuantity) {
 			throw BusinessRuntimeException.getInstance("该规格不支持一次购买多个");
 		}
 		if (multiQuantity) {
@@ -487,7 +491,7 @@ public class OrderDonServiceImpl extends ServiceImpl<OrderDonMapper, OrderDon> i
 			}
 		}
 		//是否是补差价订单
-		if (goodsDon.getType() != null && goodsDon.getType() == 5) {
+		if (priceDifferenceOrder) {
 			return generateDifferOrderDon(payRequest, goodsDon, sku);
 		}
 		if (goodsDon == null || !goodsDon.getStatus()) {