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

NI031 - Overview

• 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.

NI031 - Details

• 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