How To Fix ATP_CONTROL020 - Requirement &2 for doc. category &1 is locked and cannot be processed.

SAP Error Message - Details

• Message type: E = Error

• Message class: ATP_CONTROL -

• Message number: 020

• Message text: Requirement &2 for doc. category &1 is locked and cannot be processed.

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 ATP_CONTROL020 - Requirement &2 for doc. category &1 is locked and cannot be processed. ?

  The SAP error message ATP_CONTROL020 indicates that a requirement for a specific document category is locked and cannot be processed. This typically occurs in the context of Advanced Planning (ATP) or when dealing with stock requirements in SAP.
  Cause:
  
  Document Locking: The requirement document (like a sales order, purchase order, etc.) is currently locked by another user or process. This can happen if another transaction is being processed that involves the same document.
  System Configuration: There may be specific configurations in the system that enforce locking mechanisms for certain document categories.
  Transaction Errors: Sometimes, errors in previous transactions can lead to a document being left in a locked state.
  
  Solution:
  
  
  Check Document Lock: Use transaction code SM12 to check for locks on the document. You can search for the document number and see if it is locked by another user or process.
  
  If you find a lock, you can either wait for the other user to complete their transaction or, if appropriate, you can delete the lock (be cautious with this approach).
  
  
  
  Review User Activity: If you have access, check if another user is currently processing the document. Communicate with them to understand if they can release the lock.
  
  
  System Configuration Review: If this issue occurs frequently, it may be worth reviewing the system configuration related to document locking. Consult with your SAP Basis or configuration team to ensure that the locking mechanisms are set up correctly.
  
  
  Transaction Retry: After resolving the lock, retry the transaction that generated the error.
  
  
  Check for Background Jobs: Sometimes, background jobs may hold locks on documents. Check if there are any running jobs that might be causing the lock.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM12: To view and manage locks.
  SM21: To check system logs for any related errors or warnings.
  ST22: To check for dumps that might provide more context on the issue.
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to ATP and document locking. You can search the SAP Support Portal for relevant notes.
  
  
  Documentation: Review SAP documentation on ATP and document management to understand how locking works and best practices for managing document processing.
  
  
  If the issue persists after trying the above solutions, it may be necessary to involve your SAP support team or consult with SAP directly for further assistance.