How To Fix MN403 - Invalid line category & (internal error)

SAP Error Message - Details

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 403

• Message text: Invalid line category & (internal error)

What causes this issue?

There is an indicator for each list line. This controls which function
is performed when the line is selected.
However, indicator &V1& is not allowed.

How to fix this error?

Please contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MN403 - Invalid line category & (internal error) ?

  The SAP error message MN403 "Invalid line category & (internal error)" typically occurs in the context of the Material Management (MM) module, particularly when dealing with invoice verification or material document processing. This error indicates that there is an issue with the line category being used in a transaction, which is not recognized or is invalid.
  Causes:
  
  Incorrect Line Category: The line category specified in the transaction does not exist or is not valid for the operation being performed.
  Configuration Issues: There may be a configuration issue in the system where the line categories are not properly defined or have been altered.
  Data Corruption: There could be corruption in the data related to the line categories, leading to the system not recognizing them.
  Custom Development: If there are custom developments or enhancements in the system, they might be causing conflicts with standard line categories.
  
  Solutions:
  
  Check Line Category: Verify the line category being used in the transaction. Ensure that it is valid and exists in the system.
  Configuration Review: Review the configuration settings in the SAP system related to line categories. This can be done through transaction codes like SPRO (SAP Project Reference Object) to navigate to the relevant configuration settings.
  Data Consistency Check: Run data consistency checks to identify any issues with the line categories. This can be done using transaction codes like SE11 (Data Dictionary) to check the relevant tables.
  Debugging: If you have access to debugging tools, you can debug the transaction to identify where the error is being triggered and what the expected values are.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error. There may be patches or updates available that resolve the issue.
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MIRO (Invoice Verification), MIGO (Goods Movement), and others that may be related to the process you are working on.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  Documentation: Review SAP documentation related to invoice verification and material management for additional context on line categories and their usage.
  
  By following these steps, you should be able to identify the cause of the MN403 error and implement a solution to resolve it.