SRA フェイルオーバーで N2Dr3Xml20XmlValidateExceptionE エラーが報告され、デバイスの昇格に失敗する

SRAフェイルオーバー処理が失敗し、次のメッセージが表示されます：

Failed to promote replica devices. A general system error occurred: N2Dr3Xml20XmlValidateExceptionE value '' does not match regular expression facet '[+\-]?[0-9]+'...

OTV application.log ファイルでは、ログに次のようなエラーが報告されます：

{"stream":"stdout","log":"{"timestamp":"2025-10-31T14:51:54.5476220Z","level":"info","message":"UpdateErrorMessage: Job document updated Received status: 500 as response status with response = {"error":{"message":"Exception : [400 Bad Request] during [PATCH] to [https://<cluster IP>:443/api/protocols/nfs/export-policies/###?return_records=true] [ExportPolicyFeignClient#modifyExportPolicy(URI,String,ExportPolicy)]: [{\\n  \\"error\\": {\\n   \\"message\\": \\"The export policy was not created because of duplicate export policy rules present in the request.\\",\\n   \\"code\\": \\"1704071\\"\\n  }\\n}]","code":500}