How To Fix RSDD303 - Maintenance of aggregate &3 not possible due to block by user &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD - Message class for data manager

• Message number: 303

• Message text: Maintenance of aggregate &3 not possible due to block by user &1

What causes this issue?

For the maintenance of aggregate &V3& for InfoCube &V2& the aggregate
must be locked. The aggregate is however, already blocked by another
transaction from user &V1&.
With the other transaction, you can also be dealing with the
maintenance of aggregate &V3&, the creation of this aggregate or the
use of the aggregate for the creation of another one.

System Response

The maintenance of aggregate &V3& is not possible at the moment.

How to fix this error?

Check why the aggregate &V3& is locked by user &V1& and then call the
maintenance up again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD303 - Maintenance of aggregate &3 not possible due to block by user &1 ?

  The SAP error message RSDD303 indicates that the maintenance of an aggregate (in this case, identified by &3) is not possible because it is currently blocked by a user (identified by &1). This typically occurs in the context of SAP BW (Business Warehouse) when a user is performing operations that lock the aggregate for maintenance.
  Cause:
  
  User Lock: The aggregate is being edited or maintained by another user, which prevents other users from making changes to it.
  Long-Running Transactions: A transaction that is taking a long time to complete may hold a lock on the aggregate.
  System Configuration: Certain configurations or settings in the BW system may lead to locks being held longer than necessary.
  
  Solution:
  
  
  Identify the Blocking User: 
  
  Use transaction code SM12 to check for locks in the system. You can filter by the user ID mentioned in the error message (&1) to see what locks they have.
  
  
  
  Wait for Release: If the blocking user is performing legitimate maintenance, you may need to wait until they complete their task and release the lock.
  
  
  Terminate the Lock: If the blocking transaction is stuck or taking too long, and you have the necessary authorizations, you can manually delete the lock:
  
  In transaction SM12, select the lock entry and delete it. Be cautious with this approach, as it may lead to data inconsistencies if the user is in the middle of a critical operation.
  
  
  
  Check for Long-Running Processes: 
  
  Use transaction SM66 to monitor active processes in the system. If you find a long-running process that is holding the lock, you may need to investigate further.
  
  
  
  Communicate with the User: If possible, reach out to the user who is blocking the aggregate to understand their activity and coordinate maintenance efforts.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  SM66: To monitor active processes in the system.
  RSD1: To manage InfoObjects and aggregates in BW.
  
  
  
  Documentation: Refer to SAP Help documentation for more details on aggregates and locking mechanisms in BW.
  
  
  Best Practices: Implementing a process for managing aggregate maintenance can help reduce the occurrence of such locks, such as scheduling maintenance during off-peak hours or using a change management process.
  
  
  By following these steps, you should be able to resolve the RSDD303 error and continue with your aggregate maintenance tasks.