PRLOCK
from the FAQ thread;
Q : Viewing / releasing locks
http://{Server}/niku/app?action=security.locks
A : This undocumented page provides an overview of all system "locks".
For example "Import Export Lock" is a project that is currently locked (being editted in OWB/MSP),
the other available lock types refelect system functionality.
(This screen is displaying the contents of the PRLOCK table)
But you should NOT really be "clearing locks" using this screen unless explicty directed to by CA-Support