How To Fix MS409 - You have chosen an illegal function

MS409 - Overview

• Message type: E = Error

• Message class: MS - SAP customer enhancement project messages

• Message number: 409

• Message text: You have chosen an illegal function

What causes this issue?

The function "Delete local values" can be used to delete all the local
values which exist for a (cursor) selected global value. It can be used
only if a global value has been selected (with the cursor).

Error message extract from SAP system. Copyright SAP SE.

MS409 - Details

• The SAP error message MS409, which states "You have chosen an illegal function," typically occurs in the context of Material Management (MM) or Production Planning (PP) modules when a user attempts to perform an action that is not allowed or is not valid in the current context.
  Causes:
  
  Invalid Function Selection: The user may have selected a function or option that is not applicable to the current transaction or data context.
  Authorization Issues: The user may not have the necessary authorizations to perform the selected function.
  System Configuration: There may be configuration settings in the SAP system that restrict certain functions based on the current state of the document or transaction.
  Data Integrity Issues: The data being processed may not meet the required criteria for the function being attempted.
  
  Solutions:
  
  Check Function Validity: Review the function you are trying to execute and ensure it is valid for the current transaction or context. Refer to the SAP documentation