How To Fix CP311 - Task list &1 sequence &2 is used as a ref. sequence by another sequence

SAP Error Message - Details

• Message type: E = Error

• Message class: CP - Task list messages: Core data

• Message number: 311

• Message text: Task list &1 sequence &2 is used as a ref. sequence by another sequence

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CP311 - Task list &1 sequence &2 is used as a ref. sequence by another sequence ?

  The SAP error message CP311 indicates that a task list (or routing) is being referenced by another sequence, which prevents you from making certain changes or deletions to the task list. This is a common issue in SAP when dealing with production planning and control, particularly in the context of task lists and sequences.
  Cause:
  The error occurs when:
  
  You are trying to delete or modify a task list (routing) that is currently being used as a reference in another sequence.
  The system enforces referential integrity, meaning that it does not allow changes to objects that are still in use by other objects.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify the Reference: 
  
  Use transaction code CP03 (Display Task List) or CA03 (Display Routing) to check where the task list is being referenced.
  Look for the sequences that are using the task list in question.
  
  
  
  Remove the Reference:
  
  If you need to delete or modify the task list, you must first remove it from any sequences that are referencing it.
  Use transaction code CP02 (Change Task List) or CA02 (Change Routing) to make the necessary changes.
  
  
  
  Check Dependencies:
  
  Ensure that there are no other dependencies or references to the task list in other areas of the system, such as production orders or planned orders.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or help files for more information on task lists and sequences to understand the implications of your changes.
  
  
  
  Seek Help from SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting SAP Notes for any known issues or patches related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CP01, CP02, CP03, CA01, CA02, and CA03 for creating, changing, and displaying task lists and routings.
  Referential Integrity: Understand the concept of referential integrity in SAP, which ensures that relationships between objects are maintained correctly.
  SAP Notes: Check SAP Notes for any specific fixes or updates related to this error message.
  
  By following these steps, you should be able to resolve the CP311 error and manage your task lists and sequences effectively.