How To Fix ESH_OM_OBJ_MODEL_REP316 - Foreign key assignment with field &1 or &2 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_OM_OBJ_MODEL_REP - Object Model Repository

• Message number: 316

• Message text: Foreign key assignment with field &1 or &2 already exists

What causes this issue?

You tried to assign the two node fields &v1& and &v2&within the
definition of a relation, but there is already an assignment using one
of the two fields.
Each field can only be assigned to one other field.

System Response

The assignment is not valid.

How to fix this error?

Correct your entries accordingly.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ESH_OM_OBJ_MODEL_REP316 - Foreign key assignment with field &1 or &2 already exists ?

  The SAP error message ESH_OM_OBJ_MODEL_REP316 indicates that there is a foreign key assignment issue in the Object Model Repository (OMR) of the SAP Enterprise Search (ESH) system. Specifically, it suggests that there is an attempt to create a foreign key assignment with a field that already exists in the system, which violates the uniqueness constraint for foreign key assignments.
  Cause:
  
  Duplicate Foreign Key Assignment: The error typically occurs when you try to create a foreign key relationship using a field that has already been assigned as a foreign key in the same context.
  Configuration Issues: There may be misconfigurations in the Object Model or the underlying data model that lead to this conflict.
  Data Model Changes: If there have been recent changes to the data model, such as adding or modifying fields, it may lead to conflicts with existing foreign key assignments.
  
  Solution:
  
  Check Existing Foreign Key Assignments: Review the existing foreign key assignments in the Object Model Repository to identify if the fields mentioned in the error message (&1 or &2) are already assigned as foreign keys.
  Remove Duplicate Assignments: If you find that the fields are already assigned, you may need to remove the duplicate assignment or modify your new assignment to use a different field.
  Adjust Data Model: If the error is due to recent changes in the data model, ensure that the changes are correctly reflected in the Object Model Repository and that there are no conflicts.
  Consult Documentation: Refer to SAP documentation or notes related to the Object Model Repository and foreign key assignments for specific guidelines and best practices.
  Use Transaction Codes: Utilize relevant transaction codes (like SE11 for Data Dictionary or SE80 for Object Navigator) to inspect and modify the data model and foreign key assignments.
  
  Related Information:
  
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may resolve the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Testing: After making changes, ensure to test the Object Model to confirm that the foreign key assignments are functioning as expected without errors.
  
  If the problem persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.