How To Fix NI031 - Invalid line category & (internal error)

SAP Error Message - Details

• Message type: E = Error

• Message class: NI - Document index processing

• Message number: 031

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

What causes this issue?

An indicator has been stored for the current list lines. This indicator
determines which function is performed when the list line is chosen with
the mouse. However, indicator &V1& is invalid.

How to fix this error?

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 NI031 - Invalid line category & (internal error) ?

  The SAP error message NI031 "Invalid line category & (internal error)" typically occurs in the context of financial document processing, particularly when dealing with line items in accounting documents. This error indicates that there is an issue with the line category specified in the document, which is not recognized or is invalid.
  Causes:
  
  Incorrect Line Category: The line category specified in the document may not exist or may have been incorrectly entered.
  Configuration Issues: There may be a configuration issue in the system related to the line categories used in financial documents.
  Data Corruption: There could be data corruption in the document or in the configuration tables that define line categories.
  Custom Development: If there are custom developments or enhancements in the system, they may not be handling line categories correctly.
  
  Solutions:
  
  Check Line Category: Verify the line category used in the document. Ensure that it is valid and exists in the system.
  Review Configuration: Check the configuration settings for line categories in the relevant financial module (e.g., FI, CO). Ensure that all necessary line categories are defined correctly.
  Debugging: If you have access to debugging tools, you can trace the execution to see where the error is being triggered. This may provide insights into what is causing the invalid line category.
  Consult Documentation: Review SAP documentation or notes related to the specific transaction or process you are working with to see if there are any known issues or updates.
  SAP Support: If the issue persists, consider reaching out to SAP support for assistance. Provide them with details of the error, including the transaction code, the steps leading to the error, and any relevant configuration settings.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to financial postings, such as FB01 (Post Document), FB50 (G/L Account Document), etc.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches or updates.
  Community Forums: SAP Community and other forums can be useful for finding similar issues faced by other users and their solutions.
  
  By following these steps, you should be able to identify the cause of the NI031 error and implement a solution to resolve it.