3782110 - "There Was an Application Error" When Submitting a Custom Onboarding Task with an Attachment

• An application error occurs when submitting a custom onboarding task that contains attachment fields.
• Networks logs: {
    "error": {
      "code": "BadRequest",
      "message": "Operation failed because of errors.",
      "numericSeverity": 4,
      "details": [
        {
          "numericSeverity": 4,
          "code": "EmployeeHrisGoDmsErrorIncompleteMetadata",
          "message": "To associate the attachment dummy(2).png with ID 15,337, please provide the value for field subjectUser."
        } 

SAP SuccessFactors Onboarding

onboarding custom task, application error, attachment upload, attachment field configuration, externalcode, subjectuser, incomplete entity metadata, EmployeeHrisGoDmsErrorIncompleteMetadata, entity id, manage data, configure object definitions, new hire tasks, document category, "To associate the attachment dummy(2).png with ID 15,337, please provide the value for field subjectUser.", attachment field. , KBA , LOD-SF-OBX-NHA , New Hire Activities (activities, tasks, buddy, equipment) , Problem