fix(saleForm): 添加contractId字段的必填验证规则

src/views/saleManage/saleOrder/accountstatement/components/saleForm.vue

@@ -281,6 +281,7 @@
             trigger: 'change'
           },
           sourceId: { required: true, message: '请选择', trigger: 'change' },
+          contractId: { required: true, message: '请选择', trigger: 'change' },
         }
       };
     },