How To Fix MQ858 - Table &1 is converted using a special program; selection not possible

MQ858 - Overview

• Message type: E = Error

• Message class: MQ - Messages for Euro Changeover Package

• Message number: 858

• Message text: Table &1 is converted using a special program; selection not possible

What causes this issue?

You have modified a standard SAP table which is converted during the
local currency changeover using a special program. This table is not
allowed to be transferred to the "selection of user-defined
developments".

System Response

This table cannot be flagged as "relevant to conversion".

How to fix this error?

Contact SAP to adapt the special program or to have it adapted.

Error message extract from SAP system. Copyright SAP SE.

MQ858 - Details

• The SAP error message MQ858 indicates that a specific table (denoted as &1 in the message) is being converted using a special program, which prevents selection operations on that table. This typically occurs during database migrations, upgrades, or when a table is undergoing structural changes.
  
  Cause:
  
  Table Conversion: The table is in the process of being converted to a new format or structure, which is often part of a system upgrade or data migration.
  Locking Mechanism: During the conversion process, the table is locked to prevent any read or write operations that could lead to data inconsistencies.
  Special Program Execution: A specific program or transaction is running that is responsible for the conversion, and it has exclusive access to the table.
  
  
  Solution:
  
  Wait for Completion: The simplest solution is to wait until the conversion process is completed. Once the program finishes, the table will be available for selection again.
  Check Background Jobs: Use transaction codes like SM37