How To Fix C1066 - Class is being processed by another user

SAP Error Message - Details

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 066

• Message text: Class is being processed by another user

What causes this issue?

You want to edit the allocation to a class. This activity requires that
the class is not changed in the meantime. However, another user is
currently editing the class or allocations to the class.

How to fix this error?

Try again later.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1066 - Class is being processed by another user ?

  The SAP error message C1066, which states "Class is being processed by another user," typically occurs when a user attempts to access or modify a class (such as a method or function module) that is currently being edited or locked by another user. This is a common issue in environments where multiple users are working on the same development objects.
  Cause:
  
  Lock Mechanism: SAP uses a locking mechanism to prevent simultaneous changes to the same object. If one user is editing a class, the system locks it to prevent other users from making changes until the first user has finished.
  Long Running Transactions: If a user has left a transaction open for an extended period, it can lead to locks that prevent others from accessing the object.
  Transport Requests: If the class is part of a transport request that is being processed, it may also be locked for changes.
  
  Solution:
  
  Wait for Release: The simplest solution is to wait until the other user has finished their work and released the lock. You can check with your colleagues to see if they are currently working on the class.
  Check Lock Entries: You can use transaction code SM12 to check for lock entries. This will show you which user is currently holding the lock on the class. If the lock is held by a user who is no longer active, you may need to contact your SAP Basis team to release the lock.
  Release Locks: If you have the necessary authorizations, you can manually delete the lock entries in SM12. However, this should be done with caution and ideally after confirming with the user who holds the lock.
  Avoid Long Transactions: Encourage best practices among team members to avoid leaving transactions open for long periods, which can lead to unnecessary locks.
  Use Version Control: If your organization uses version control or a similar system, ensure that changes are managed properly to avoid conflicts.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SE80: To access the Object Navigator, where you can see the status of classes and other objects.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to locking mechanisms or provide updates on known bugs.
  User Communication: Establish a communication protocol among developers to inform each other when they are working on shared objects to minimize conflicts.
  
  If the issue persists or if you are unsure about releasing locks, it is advisable to consult with your SAP Basis team or system administrator for further assistance.