How To Fix MC478 - & & & for background conversion already entered

MC478 - Overview

• Message type: E = Error

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

• Message number: 478

• Message text: & & & for background conversion already entered

What causes this issue?

A database operation is to be marked for execution in the background.
However, this operation is already entered in the table which collects
these database operations until they can be executed in the background.

System Response

The system continues.

How to fix this error?

No action necessary. This message is only for information. You might
possibly want to find out why this request was marked repeatedly.
Perhaps the program (conversion program) which executes the database
operations has not been executing for awhile.

Error message extract from SAP system. Copyright SAP SE.

MC478 - Details

• The SAP error message MC478 typically indicates an issue related to background processing in the context of data conversion or data transfer, particularly in the area of Material Management (MM) or Inventory Management (IM). The error message usually states something along the lines of "Background conversion already entered," which suggests that a background job for a specific process has already been scheduled or is currently running.
  
  Cause:
  
  Duplicate Job Submission: The error often occurs when a user attempts to submit a background job that has already been submitted or is currently in progress.
  Job Overlap: If a job is still running and another attempt is made to start the same job, this error will be triggered.
  System Lock: There may be a lock on the data or process that prevents the job from being executed again until the first job completes.
  
  
  Solution:
  
  Check Job Status: Use transaction code SM37 to check the status of background jobs.