How To Fix S1426 - Internal error: unknown action

SAP Error Message - Details

• Message type: E = Error

• Message class: S1 - Statistik / SAP-Monitor

• Message number: 426

• Message text: Internal error: unknown action

What causes this issue?

The system detected a planning with an action for which it could not
find a description entry in the table SDBAC. Maybe the planning was
entered with an earlier version of the calendar and the corresponding
action is no longer supported.

System Response

Plannings with unknown action types may not be changed.

How to fix this error?

Report this problem to SAP.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message S1426 - Internal error: unknown action ?

  The SAP error message S1426 "Internal error: unknown action" typically indicates that there is an issue within the SAP system that is not being handled correctly. This error can arise from various underlying causes, and troubleshooting it may require a systematic approach. Here are some potential causes, solutions, and related information:
  Causes:
  
  Configuration Issues: Incorrect or incomplete configuration settings in the SAP system can lead to this error.
  Custom Code: If there are custom developments or enhancements in the system, they may not be handling certain actions properly.
  System Bugs: There may be bugs in the SAP software version you are using, which could lead to unexpected behavior.
  Data Inconsistencies: Inconsistent or corrupted data in the database can trigger internal errors.
  Authorization Issues: Lack of proper authorizations for certain actions can also lead to this error.
  
  Solutions:
  
  Check SAP Notes: Look for relevant SAP Notes in the SAP Support Portal. SAP frequently releases notes that address known issues and provide fixes or workarounds.
  Review Custom Code: If you have custom developments, review the code to ensure that it is correctly implemented and does not interfere with standard SAP processes.
  System Logs: Check the system logs (transaction SM21) for any additional error messages or warnings that could provide more context about the issue.
  Transaction Codes: If the error occurs during a specific transaction, try to replicate the issue in a different environment (e.g., development or quality assurance) to see if it is environment-specific.
  Data Consistency Checks: Run data consistency checks to identify and resolve any inconsistencies in the database.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including transaction codes, user actions leading to the error, and any relevant logs.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM21 (System Log), ST22 (Dump Analysis), and SLG1 (Application Log) to gather more information about the error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  System Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these often contain fixes for known issues.
  
  By following these steps, you should be able to diagnose and potentially resolve the S1426 error in your SAP system.