How To Fix ESH_OM_OBJ_MODEL_RP2320 - Reverse/source cardinality "&3" does not fit to foreign key definitions

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_OM_OBJ_MODEL_RP2 - Object Model Repository (2)

• Message number: 320

• Message text: Reverse/source cardinality "&3" does not fit to foreign key definitions

What causes this issue?

All key fields of node &v2& of object type &v1& are specified in the
foreign key definition of the composition. In this case only a
cardinality "Exactly one" or "Up to one" makes sense.

System Response

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

How to fix this error?

In the modeler for search and analytics adjust the reverse cardinality
or the foreign key definition.
When importing data adjust the source cardinality or the foreign key
definition.

Procedure for System Administrators

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_RP2320 - Reverse/source cardinality "&3" does not fit to foreign key definitions ?

  The SAP error message ESH_OM_OBJ_MODEL_RP2320 indicates an issue with the reverse or source cardinality of a relationship in the object model, specifically that it does not align with the foreign key definitions. This error typically arises in the context of the SAP Enterprise Search or the SAP Business Object Model.
  Cause:
  
  Cardinality Mismatch: The error suggests that the defined cardinality for a relationship (e.g., one-to-many, many-to-one) does not match the foreign key constraints defined in the database or the object model.
  Model Definition Issues: There may be inconsistencies in how the object model is defined, particularly in the relationships between entities.
  Data Model Changes: If there have been recent changes to the data model or the underlying database schema, these changes may not have been reflected in the object model configuration.
  
  Solution:
  
  Review Object Model Definitions: Check the object model definitions in the SAP system to ensure that the cardinality settings for the relationships are correctly defined. Make sure they align with the foreign key constraints in the database.
  Adjust Cardinality: If the cardinality is incorrectly set, adjust it to match the foreign key definitions. This may involve changing the relationship type from one-to-many to many-to-one or vice versa.
  Rebuild or Refresh the Model: If changes have been made to the underlying data model, consider rebuilding or refreshing the object model to ensure that it reflects the current state of the database.
  Check for Dependencies: Ensure that there are no other dependencies or constraints that might be causing the mismatch. This may involve reviewing related tables or entities.
  Consult Documentation: Refer to SAP documentation or notes related to the specific version of the software you are using for any known issues or additional guidance.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to this error message. SAP frequently updates its knowledge base with solutions to common issues.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to inspect the data model and relationships.
  Testing: After making changes, test the object model to ensure that the error is resolved and that the relationships function as expected.
  Support: If the issue persists, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the steps you have taken.
  
  By following these steps, you should be able to identify and resolve the cause of the ESH_OM_OBJ_MODEL_RP2320 error in your SAP system.