How To Fix S1426 - Internal error: unknown action

S1426 - Overview

• 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