Object could not be locked

What happened?

You attempted to change a Transport Request / Task.

System Response

This object is currently being edited by another user and is therefore
locked (by an ENQUEUE lock).


&PROCEDURE&
Wait until the other user has finished.
If the ENQUEUE lock remains as a result of a mode termination or due to
other serious problems in the lock administration and no other user is
editing the object, you can delete the lock using transaction SM12. This
operation is logged by the system.

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.