diff --git a/erp/sale.go b/erp/sale.go
index f7e232a..82bb9f4 100644
--- a/erp/sale.go
+++ b/erp/sale.go
@@ -315,3 +315,13 @@ func (s *sale) History(ctx context.Context, args ArgsSaleHistory) (reply ReplySa
 	err = xClient.Call(ctx, "History", args, &reply)
 	return
 }
+
+// Cancel @TITLE 作废采购合同
+func (s *sale) Cancel(ctx context.Context, saleId int64) (err error) {
+	xClient, err := client.GetClient(s)
+	if err != nil {
+		return
+	}
+	reply := 0
+	return xClient.Call(ctx, "Cancel", saleId, &reply)
+}