How To Fix RD156 - The selected data source is locked by another process

RD156 - Overview

• Message type: E = Error

• Message class: RD - CO-PA Connection to SAP BW

• Message number: 156

• Message text: The selected data source is locked by another process

What causes this issue?

Data should be read from a summarization level, but this level is
currently blocked. This could be because it is being updated, for
example. Alternatively, data should be read from the CO-PA line items,
but an update is being carried out.

System Response

The read request cannot be executed.

How to fix this error?

Carry out the read request at a later point in time. The status of the
DataSource is not changed.

Error message extract from SAP system. Copyright SAP SE.

RD156 - Details

• The SAP error message RD156, which states "The selected data source is locked by another process," typically occurs in the context of SAP Business Warehouse (BW) or SAP BusinessObjects when a data source is being accessed or modified by another user or process. This can prevent you from executing queries or performing certain operations on that data source.
  Causes:
  
  Concurrent Access: Another user or process is currently accessing or modifying the data source, leading to a lock.
  Long-Running Queries: A long-running query or data load process may have locked the data source.
  System Configuration: Certain configurations in the SAP system may lead to locking issues, especially if the data source is not properly released after use.
  Transaction Management: If a transaction is not properly committed or rolled back, it may leave the data source in a locked state.
  
  Solutions:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation