How To Fix MS409 - You have chosen an illegal function

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message MS409 - You have chosen an illegal function ?

  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 or help resources for guidance on valid functions.
  Review Authorizations: Ensure that you have the necessary authorizations to perform the action. If not, contact your SAP security administrator to request the required permissions.
  Consult Configuration Settings: If you have access, check the configuration settings related to the transaction or function. This may involve working with your SAP Basis or configuration team to ensure that the system is set up correctly.
  Data Validation: Verify that the data you are working with is complete and correct. Look for any missing or incorrect entries that could be causing the issue.
  SAP Notes and Support: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error. Sometimes, there are known issues or patches that can resolve the problem.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to MM or PP, such as MIGO, MB1A, or CO01.
  SAP Documentation: Refer to the official SAP Help Portal for detailed documentation on the specific transaction or function you are using.
  Community Forums: Consider checking SAP Community forums or other user groups for similar issues and solutions shared by other users.
  
  If the problem persists after trying the above solutions, it may be beneficial to escalate the issue to your SAP support team or consult with an SAP expert for further assistance.