deleteIssueRelation

mutation DeleteIssueRelation($etag: String!, $originIssueId: ID!, $relatedIssueId: ID!) {
  deleteIssueRelation(etag: $etag, originIssueId: $originIssueId, relatedIssueId: $relatedIssueId) {
    originIssueId
    relatedIssueId
  }
}

{
  "etag": "string",
  "originIssueId": "id",
  "relatedIssueId": "id"
}

{
  "data": {
    "deleteIssueRelation": {
      "originIssueId": 1,
      "relatedIssueId": 1
    }
  }
}