Request/task &1 is not completely locked

What causes this issue?

Not all the objects in request &V1& are locked.

System Response

The function terminates.

How to fix this error?

Go to the request overview of the Transport Organizer.
Position the cursor on the request.
Choose <LS>Request/task</> -> <LS>Object list</> -> <LS>Lock objects
</>.
If the objects cannot be locked, an error log appears that tells you
how to proceed.

Error message extract from SAP system. Copyright SAP SE.