How To Fix MC291 - Pool & still exists in the database

MC291 - Overview

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 291

• Message text: Pool & still exists in the database

What causes this issue?

When trying to delete a matchcode object, the pool created for the
matchcode object was found to exist still in the database.

System Response

The matchcode definition cannot be deleted from the ABAP/4 Dictionary
because data might be lost during the delete operation. The delete
operation is rejected, no changes are made.

How to fix this error?

The pool belonging to the matchcode object must be explicitly deleted
before the matchcode definition can be removed from the ABAP/4
Dictionary. To delete the matchcode pool, call the function
<LS>Database utility</> from the <LS>Utility</> menu of the matchcode
object maintenance screen. After a save prompt, the matchcode pool is
deleted from the database. The data built for this matchcode are lost
(unless an older database version can be imported).

Error message extract from SAP system. Copyright SAP SE.

MC291 - Details

• The SAP error message MC291 ("Pool & still exists in the database") typically occurs in the context of the Material Management (MM) module, particularly when dealing with the Material Master or related data structures. This error indicates that there are still entries in the database that are associated with a specific pool, which prevents the deletion or modification of that pool.
  
  Cause:
  The error is usually caused by one of the following reasons:
  
  Existing Data: There are still records in the database that reference the pool you are trying to delete or modify. This could be related to material documents, inventory records, or other dependent data.
  Incomplete Deletion Process: The deletion process may not have been completed successfully, leaving orphaned records that still reference the pool.
  Data Integrity Constraints: SAP enforces data integrity, and if there are constraints that prevent the deletion of the pool, this error will occur.
  
  
  Solution:
  To resolve the MC291 error, you can