How To Fix /ISDFPS/MM478 - NSN group/class still used in NSNs

/ISDFPS/MM478 - Overview

• Message type: E = Error

• Message class: /ISDFPS/MM -

• Message number: 478

• Message text: NSN group/class still used in NSNs

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /ISDFPS/MM478 - NSN group/class still used in NSNs ?

  The SAP error message /ISDFPS/MM478 NSN group/class still used in NSNs typically occurs in the context of managing National Stock Numbers (NSNs) within the SAP system, particularly in the Materials Management (MM) module. This error indicates that the NSN group or class you are trying to delete or modify is still being referenced by one or more NSNs in the system.
  
  Cause:
  
  Active NSNs: The NSN group or class you are attempting to delete is still associated with existing NSNs in the database.
  Data Integrity: SAP enforces data integrity rules to prevent the deletion of groups or classes that are still in use, which could lead to inconsistencies in the data.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Usage:
  
  Use transaction codes like MM03 (Display Material) or MM02 (Change Material) to check which NSNs are still using the group/class.
  You can also run reports or queries to list all NSNs associated with the specific