How To Fix AD377 - Key format changed; update the data

AD377 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 377

• Message text: Key format changed; update the data

What causes this issue?

Activation of the table has been cancelled. The table key has changed.
The table of type POOL/CLUSTER contains data. Before activating the
table, you must unload the data and then reload it again afterwards. If
the key has changed, ensure that no two records in the table are
identical with respect to the new key.

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?

Use the online conversion function to convert a POOL/CLUSTER-type table
(i.e. unload the data, activate the ABAP/4 Dictionary table, adjust the
database table, and reload the data).
INCLUDE ADIC-DB-UTILITIES
INCLUDE ADIC-UPDATEFORCE

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD377 - Key format changed; update the data ?

  The SAP error message AD377, which states "Key format changed; update the data," typically occurs when there is a change in the key structure of a database table or a data object that is being accessed. This can happen due to various reasons, such as changes in the underlying data model, updates to the SAP system, or modifications made to the table structure.
  
  Cause:
  
  Change in Key Structure: The primary cause of this error is that the key fields of a database table have been modified. This could involve adding, removing, or changing the data type of key fields.
  Data Inconsistency: If the application is trying to access data that was created with an old key format, it may lead to inconsistencies and trigger this error.
  Transport Issues: If changes were transported from one system to another (e.g., from development to production) and the data was not updated accordingly, this error may arise.
  
  
  Solution:
  
  
  Update the