How To Fix ICC_CN851 - Could not lock document &1 in lot &2 and book &3

SAP Error Message - Details

• Message type: E = Error

• Message class: ICC_CN - Nachrichten zum Druck vornumerierter SD-Belege

• Message number: 851

• Message text: Could not lock document &1 in lot &2 and book &3

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message ICC_CN851 - Could not lock document &1 in lot &2 and book &3 ?

  The SAP error message ICC_CN851 indicates that the system was unable to lock a specific document in a given lot and book. This error typically arises in the context of document processing in SAP, particularly in the area of Controlling (CO) or Financial Accounting (FI).
  Cause:
  
  Document Locking Mechanism: SAP uses a locking mechanism to prevent multiple users from making changes to the same document simultaneously. If another user or process is currently accessing or has locked the document, you will encounter this error.
  Long-running Transactions: If a transaction takes too long to complete, it may hold a lock on the document longer than expected, leading to this error for other users trying to access the same document.
  System Configuration Issues: There may be configuration issues or bugs in the system that affect the locking mechanism.
  Database Issues: Sometimes, database locks or issues can lead to this error.
  
  Solution:
  
  Check Document Status: Verify if the document is currently being processed by another user. You can use transaction codes like SM12 (to check locks) to see if the document is locked by another user.
  Wait and Retry: If the document is locked by another user, you may need to wait for that user to complete their transaction and then try again.
  Release Locks: If you have the necessary authorizations, you can manually release the lock using transaction SM12. However, be cautious when doing this, as it may disrupt other users.
  Review Long-running Processes: Identify any long-running transactions that may be holding locks and optimize them if possible.
  Check for System Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these may resolve known issues related to document locking.
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view and manage locks), SM21 (to check system logs), and ST22 (to check dumps) for troubleshooting.
  User Authorizations: Ensure that users have the appropriate authorizations to access and modify the documents in question.
  SAP Community: Engage with the SAP Community or forums for additional insights and experiences from other users who may have encountered the same issue.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.