How To Fix CPCL121 - Sequence task list header invalid or not loaded

SAP Error Message - Details

• Message type: E = Error

• Message class: CPCL - Service Layer for Plans, Sequences, Operations, and Subober.

• Message number: 121

• Message text: Sequence task list header invalid or not loaded

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CPCL121 - Sequence task list header invalid or not loaded ?

  The SAP error message CPCL121, which states "Sequence task list header invalid or not loaded," typically occurs in the context of using the SAP Production Planning (PP) module, particularly when dealing with task lists and production orders. This error indicates that the system is unable to find or recognize the sequence task list header that you are trying to access or use.
  Causes:
  
  Invalid Task List: The sequence task list you are trying to use may not exist or may have been deleted.
  Incorrect Configuration: The task list may not be properly configured or may not be assigned to the relevant production process.
  Authorization Issues: The user may not have the necessary authorizations to access the task list.
  Data Inconsistency: There may be inconsistencies in the database or issues with the data integrity of the task list.
  Transport Issues: If the task list was recently transported from another system, it may not have been properly imported.
  
  Solutions:
  
  Check Task List Existence: Verify that the sequence task list exists in the system. You can do this by navigating to the relevant transaction (e.g., CA01 for creating task lists) and checking if the task list number is valid.
  Review Configuration: Ensure that the task list is correctly configured and assigned to the appropriate production process. Check the settings in the task list and ensure all required fields are filled out correctly.
  User Authorizations: Check the user roles and authorizations to ensure that the user has the necessary permissions to access the task list.
  Data Consistency Check: Run consistency checks on the task list data. You can use transaction codes like SE11 or SE16 to check the underlying database tables for any inconsistencies.
  Re-import Transport Requests: If the task list was recently transported, consider re-importing the transport request to ensure that all necessary data is included.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CA01 (Create Task List), CA02 (Change Task List), and CA03 (Display Task List).
  SAP Documentation: Refer to the official SAP documentation for detailed information on sequence task lists and their configuration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, it may be beneficial to involve your SAP Basis or technical team for further investigation, as they can analyze system logs and perform deeper troubleshooting.