KN401 - Data input incorrect or internal error during data retrieval

SAP Error Message - Details

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 401

• Message text: Data input incorrect or internal error during data retrieval

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message KN401 - Data input incorrect or internal error during data retrieval ?

  The SAP error message KN401 ("Data input incorrect or internal error during data retrieval") typically occurs in the context of master data management, particularly when dealing with customer master data (KNA1) or vendor master data (LFA1). This error can arise due to various reasons, including data inconsistencies, incorrect input formats, or issues with the underlying database.
  Causes:
  
  Incorrect Data Input: The data being entered may not conform to the expected format or may be missing required fields.
  Data Inconsistencies: There may be inconsistencies in the master data, such as duplicate entries or invalid references.
  Authorization Issues: The user may not have the necessary permissions to access or modify the data.
  Database Issues: There could be issues with the database, such as corruption or connectivity problems.
  Custom Code or Enhancements: If there are custom programs or enhancements in place, they may be causing conflicts or errors during data retrieval.
  
  Solutions:
  
  Check Input Data: Verify that all required fields are filled out correctly and that the data adheres to the expected formats (e.g., date formats, numeric values).
  Review Master Data: Check for inconsistencies in the master data. Use transaction codes like SE16 or SE11 to inspect the relevant tables (e.g., KNA1 for customers, LFA1 for vendors).
  Authorization Check: Ensure that the user has the necessary authorizations to access and modify the data. This can be checked in transaction SU53 after the error occurs.
  Database Health Check: If you suspect database issues, work with your database administrator to check for any errors or inconsistencies in the database.
  Debugging Custom Code: If there are custom enhancements or programs, consider debugging them to identify any issues that may be causing the error.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that resolve known issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE16 (Data Browser), SE11 (Data Dictionary), and SU53 (Authorization Check).
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including the steps that led to it and any relevant screenshots or logs.
  Documentation: Review SAP documentation related to master data management for best practices and troubleshooting tips.
  
  By following these steps, you should be able to identify the root cause of the KN401 error and implement a suitable solution.