How To Fix D9748 - The logical key &1 cannot be changed subsequently

D9748 - Overview

• Message type: E = Error

• Message class: D9 - Environment Management System

• Message number: 748

• Message text: The logical key &1 cannot be changed subsequently

What causes this issue?

You attempted to subsequently change the logical key &V1&. This change
is not permitted for this object.

System Response

The SAP System rejects your processing.

Error message extract from SAP system. Copyright SAP SE.

D9748 - Details

• The SAP error message D9748, which states "The logical key &1 cannot be changed subsequently," typically occurs when there is an attempt to modify a key field in a database table that is defined as a logical key. Logical keys are used to uniquely identify records in a table, and once they are set, they cannot be changed to maintain data integrity.
  
  Cause:
  
  Attempting to Change a Key Field: The most common cause of this error is an attempt to change a field that is part of the logical key of a database table after it has been created or populated with data.
  Data Integrity Rules: SAP enforces strict data integrity rules, and changing a logical key could lead to inconsistencies in the database.
  Custom Development: If there is custom development or enhancements that try to modify the logical key fields, this error may arise.
  
  
  Solution:
  
  Review the Code: Check the code or transaction that is