How To Fix DIWP1226 - Task list &1 &2 &3 is not valid at key date

DIWP1226 - Overview

• Message type: E = Error

• Message class: DIWP1 - Revision Planning

• Message number: 226

• Message text: Task list &1 &2 &3 is not valid at key date

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DIWP1226 - Task list &1 &2 &3 is not valid at key date ?

  The SAP error message DIWP1226 indicates that a task list (or a specific operation within a task list) is not valid at the specified key date. This typically occurs in the context of production planning or maintenance planning when the system is trying to access a task list that is either not valid or has been changed in a way that makes it invalid for the given date.
  Causes:
  
  Task List Validity Period: The task list may have a defined validity period, and the key date falls outside this range. Task lists can be set to be valid only for certain dates.
  Task List Status: The task list might be in a status that does not allow it to be used (e.g., it could be marked as "obsolete" or "inactive").
  Changes in Task List: If the task list has been modified (e.g., operations added or removed) after the key date, it may not be