repair the multiple is null

src/main/java/com/ctrip/fun/golf/domain/basic/VoucherRule.java

@@ -313,7 +313,7 @@ public class VoucherRule {
         this.createdTime = createdTime;
     }
 
-    @Column(name = "multiple")
+    @Column(name = "multiple", nullable = false)
 	public int getMultiple() {
 		return multiple;
 	}

src/main/java/com/ctrip/fun/golf/service/order/OpEventActivityOrderService.java

@@ -455,8 +455,7 @@ public class OpEventActivityOrderService
                 }
             }
         }
-
-        return order
+        BigDecimal resultAmount = order
                 .getTotalAmount()
                 .subtract(
                         new BigDecimal(orderProcessBean.getPrePayCardRefundAmount() == null ? 0
@@ -465,10 +464,11 @@ public class OpEventActivityOrderService
                                         orderProcessBean.getRefundAmount() == null ? 0
                                                 : orderProcessBean.getRefundAmount()))).add(
                                 order.getOnPayAmount() == null ? new BigDecimal(0) : order
-                                        .getOnPayAmount())).doubleValue() <= 0;
+                                        .getOnPayAmount()));
+        return resultAmount.compareTo(BigDecimal.ZERO) <= 1;
 
     }
-
+    
     @Override
     protected void returnInventory(EventActivityOrderProcessBean orderProcessBean) {
         Order order = getOrderDao().findById(orderProcessBean.getOrderId());