Problem creating Relation-to-Self field in Custom Integration

I’m trying to create a hierarchical many-to-one relation to self type in my Accounts DB.

Is there a bug here, or am I doing something wrong with this field definition?
[Note: this seems to actually be working as intended, just as it is, even with the error message]

The self-relation field in the Accounts DB schema:

    "Parent_Account": {
      "type":  "text",
      "id":    "Parent_Account",
      "name":  "Parent_Account_Rel"
      "relation": {
         "cardinality":   "many-to-one",
         "name":          "Parent Account",
         "targetName":    "Member Accounts",
         "targetType":    "Accounts",
         "targetFieldId": "id"

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