Failed to lock staging tables to prevent adding new data

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

When you start a data transfer, the system locks the corresponding
staging tables so that new data cannot be added to the tables during the
transfer. If the system fails to lock the staging tables, new data can
be added to the tables during the transfer but cannot be transferred.

How to fix this error?

Cancel the current transfer and start the transfer again. If the system
still cannot lock the staging tables, you can continue with the
transfer. However, do not add new data to the staging tables during the
transfer.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.