How To Fix DI754 - No foreign key definition found for check field &-&

DI754 - Overview

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 754

• Message text: No foreign key definition found for check field &-&

What causes this issue?

Every secondary table of a lock object must be connected to a base table
above it in the hierarchy by a join condition. This join condition must
be implemented by a foreign key. This foreign key must have the
secondary table as foreign key table and the base table above it in the
hierarchy as check table.
One of the join conditions of the lock object is implemented via a
foreign key relationship with the check field specified. For this
foreign key relationship, however, no foreign key fields can be found.

System Response

The action is cancelled.

How to fix this error?

Ensure that the join condition is implemented via a valid foreign key
relationship.

Error message extract from SAP system. Copyright SAP SE.

DI754 - Details

• The SAP error message DI754 "No foreign key definition found for check field &-&" typically occurs when there is an attempt to validate a field against a foreign key relationship in the database, but the system cannot find a corresponding foreign key definition for that field. This can happen in various scenarios, such as during data entry, data migration, or when executing certain transactions.
  
  Cause:
  
  Missing Foreign Key Definition: The most common cause is that the foreign key relationship has not been defined in the database for the specified field.
  Incorrect Field Configuration: The field may be incorrectly configured in the data dictionary (DDIC) or the table structure.
  Custom Development: If there are custom programs or enhancements, they may not have the correct foreign key checks implemented.
  Data Inconsistency: The data being entered or processed may not match the expected values defined in the foreign key table.
  
  
  Solution:
  
  
  Check Foreign Key Definition:
  
  Go to the Data Dictionary (transaction