Time-dependent data is locked; processing terminated

What causes this issue?

The system was unable to lock the database table for time-dependent data
for promotions (WRF_DISPRO_TD).

System Response

An initial calculation and transfer of time-dependent data for
promotions to SAP F<(>&<)>R are carried out only if the system is able
to lock the time-dependent data exclusively for these processes.
Processing was cancelled because it was unable to do so.

How to fix this error?

Make sure that when the initial transfer of data takes place no other
user or process is locking the time-dependent data.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.