DPV is currently locked

I see the following error in the AddressCleanse transform real time job log:

DPV ERROR - DPV is currently locked. Contact Business Objects Customer Support for assistance in unlocking DPV..

Does anyone know what would cause this error all of a sudden and how to find the cause of it?

Maybe I need to contact SAP to get the unlock code but just want to know the cause.

Thanks in advance.