How To Fix DT312 - Foreign key &-& becomes generic because key of check table was extended

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 312

• Message text: Foreign key &-& becomes generic because key of check table was extended

What causes this issue?

The key of a check table has been extended.

System Response

When the check table is activated, the foreign keys that point to this
check table are adjusted. The adjustment is carried out automatically
as follows: The foreign key definitions are extended and the foreign
keys are converted to partial foreign keys. Generic entries are
assigned to the new keys of the check table.

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?

If non-generic foreign key adjustment is required, the foreign key must
be changed appropriately using the ABAP Dictionary maintenance
transaction.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT312 - Foreign key &-& becomes generic because key of check table was extended ?

  The SAP error message DT312 indicates that a foreign key constraint has become generic due to the key of the check table being extended. This typically occurs when the structure of the check table has been modified, such as adding new fields to the primary key, which can affect the foreign key relationships in the database.
  Cause:
  
  Modification of Check Table: The primary key of the check table has been extended (e.g., additional fields have been added), which can lead to the foreign key relationship becoming generic.
  Inconsistent Data Model: The foreign key relationship no longer matches the structure of the check table, leading to potential data integrity issues.
  Database Changes: Changes made to the underlying database schema that affect the foreign key relationships.
  
  Solution:
  
  Review Check Table Structure: Check the structure of the check table to understand how the primary key has been modified. You can do this using transaction SE11 (Data Dictionary).
  Adjust Foreign Key Relationships: If necessary, adjust the foreign key relationships in the relevant table to align with the new structure of the check table. This can be done in transaction SE11 as well.
  Recreate Foreign Key: If the foreign key relationship is no longer valid, you may need to delete the existing foreign key and recreate it with the correct fields that match the new primary key of the check table.
  Data Consistency Check: After making changes, ensure that the data in the tables is consistent and that there are no orphaned records or integrity issues.
  Transport Changes: If you are working in a development environment, ensure that any changes made are transported to the quality and production environments as needed.
  
  Related Information:
  
  Transaction Codes: Use SE11 for Data Dictionary, SE14 for database utility, and SE37 for function modules related to foreign key checks.
  Documentation: Refer to SAP Help documentation for detailed information on foreign key constraints and data dictionary management.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to foreign key constraints and modifications in the data model.
  
  Best Practices:
  
  Always back up your data before making structural changes to the database.
  Document any changes made to the data model for future reference.
  Test changes in a development or quality assurance environment before applying them to production.
  
  By following these steps, you should be able to resolve the DT312 error and restore the integrity of your foreign key relationships in SAP.