message: ReplaceRelatedRecordOperation's relatedRecord can be null
diff: @@ -128,7 +128,7 @@ export interface ReplaceRelatedRecordOperation extends Operation {
  op: 'replaceRelatedRecord';
  record: RecordIdentity;
  relationship: string;
  - relatedRecord: RecordIdentity;
  + relatedRecord: RecordIdentity | null;
  }
  /**
  