grouping中有mandatory节点，但是mandatory节点的上层的 container节点的when条件不成立，还是报错了

[xinghaiquedeng]

报错：
errorTag='data-missing', severity=Error, errorPath=/test:test/test:lsps/test:lsp[test:lsp-name = 'ipv4uni'], errorMessage=missing mandatory schema node:test:uses:ipv4-conditions-type

yang模型：

/*
Copyright (C) 2019-2020 Huawei Technologies Co., Ltd. All rights reserved.
*/
module huawei-test {
  namespace "urn:huawei:yang:huawei-test";
  prefix test;
  organization
    "Huawei Technologies Co., Ltd.";
  contact
    "Huawei Industrial Base
     Bantian, Longgang
     Shenzhen 518129
     People's Republic of China
     Website: http://www.huawei.com
     Email: support@huawei.com";
  description
    "Test files for pyan.";
  revision 2020-03-24 {
    description
      "Modified some descriptions.";
    reference
      "Huawei private.";
  }
  revision 2019-03-24 {
    description
      "Initial revision.";
    reference
      "Huawei private.";
  }
  grouping ipv4-conditions-type {
    description
      "IPv4 default route matching condition configuration.";
    container default-route-match-conditions {
      when "../mode and ../mode!='null'";
      list condition {
        key "mask";
        min-elements 1;
        max-elements 4;
        description
          "Configure the matching condition for default route advertisement.";
        leaf mask {
          type uint32 {
            range "0..32";
          }
          description
            "Configure a mask that is used to match default routes.";
        }
      }
    }
  }
  
  container test {
    description
      "Configure MLDP. Query and modify MLDP parameters.";
    container lsps {
      description
        "List of Test.";
      list lsp{
        key "lsp-name";
        description
          "Configure Test.";
        leaf lsp-name {
          type string {
            length "1..31";
          }
          description
            "Test leaf LSP name.";
        }
        leaf mode {
          type string {
            length "1..31";
          }
          description
            "Test leaf LSP name.";
        }
		uses ipv4-conditions-type;
      }
    }
  }
}

数据：

<data>
    <test xmlns="urn:huawei:yang:huawei-test">
      <lsps>
        <lsp>
          <lsp-name>ipv4uni</lsp-name>
        </lsp>
      </lsps>
    </test>
 </data>