How To Fix USMD1594 - Model &1, ent.type &2: Relationship &3 is not a foreign key relationship

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 594

• Message text: Model &1, ent.type &2: Relationship &3 is not a foreign key relationship

What causes this issue?

Editing in the <LS>Fields of Foreign Key Relationships</> view is only
possible for relationships with the type <LS>foreign key relationship</>
.

System Response

The data model cannot be saved or activated.

How to fix this error?

Edit the fields in the <LS>Fields of Foreign Key Relationships</> view
in Customizing activity <DS:SIMG.FMDM_USMD001>Edit Data Model</>.

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 USMD1594 - Model &1, ent.type &2: Relationship &3 is not a foreign key relationship ?

  The SAP error message USMD1594 indicates that there is an issue with a relationship defined in a model, specifically that the relationship in question is not recognized as a foreign key relationship. This error typically arises in the context of SAP Master Data Governance (MDG) when working with data models and relationships between entities.
  Cause:
  
  
  Incorrect Relationship Definition: The relationship defined between the entities does not adhere to the foreign key constraints expected by the system. This could be due to:
  
  The relationship not being properly defined in the data model.
  The source and target entities not having a valid foreign key relationship in the underlying database tables.
  The relationship type being incorrectly specified.
  
  
  
  Data Model Configuration Issues: There may be issues in the configuration of the data model itself, such as missing or incorrect settings for the entities involved.
  
  
  Inconsistent Data: If the data in the database does not conform to the expected foreign key relationships, this error may also occur.
  
  
  Solution:
  
  
  Check Relationship Definition:
  
  Review the relationship definition in the data model. Ensure that the relationship is correctly defined as a foreign key relationship.
  Verify that the source and target entities are correctly specified and that the relationship type is appropriate.
  
  
  
  Verify Foreign Key Constraints:
  
  Check the underlying database tables to ensure that the foreign key constraints are correctly set up. This may involve looking at the table definitions in the database and ensuring that the keys match.
  
  
  
  Adjust Data Model Configuration:
  
  If necessary, adjust the configuration of the data model to ensure that all relationships are properly defined and that they conform to the expected foreign key relationships.
  
  
  
  Data Consistency Check:
  
  Perform a consistency check on the data to ensure that all records conform to the defined relationships. This may involve running reports or queries to identify any inconsistencies.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for guidance on defining relationships in MDG and ensuring that they are set up correctly.
  
  
  
  Testing:
  
  After making changes, test the model to ensure that the error no longer occurs and that the relationships function as expected.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on resolving it.
  MDG Configuration Guides: Review the configuration guides for SAP Master Data Governance to ensure that you are following best practices for defining relationships.
  Community Forums: Consider reaching out to SAP community forums or support channels for additional insights or similar experiences from other users.
  
  By following these steps, you should be able to identify the cause of the USMD1594 error and implement a solution to resolve it.