Message type: E = Error
Message class:  RSO_RES_QMSGS - Messages directly related to Query Designer. 
Message number: 401
Message text: Bucket &1 is still in use.
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.
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The SAP error message RSO_RES_QMSGS401 indicates that a specific bucket (in this case, identified by &1) is still in use. This typically occurs in the context of SAP BW (Business Warehouse) when you are trying to delete or modify a data target or a query that is currently being accessed or utilized by another process.
Cause: Active Processes: The bucket is being used by an active process, such as a data load, query execution, or another transaction that has not yet completed. Locks: There may be locks on the bucket due to ongoing operations, which prevent modifications or deletions. Long-running Queries: If a query is taking a long time to execute, it may hold onto the bucket longer than expected.
Solution: Check Active Processes: Use transaction codes like SM66 (Global Work Process Overview) or SM50 (Process Overview) to identify any active processes that might be using the bucket. You can look for long-running jobs or queries
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