A system shows this message for below reasons:
1) If two users try to open/work on the same transaction/room at the same time.
2) Your transaction/room is open and you directly close the browser/Tab.
How to Access: In order to remove lock please follow the below steps and video:
Location: eZee absolute PMS stay view >> Click on Front Office >> Net Locks.
Once you click on Net Locks, you will find below. Just select the room/transaction and click on Unlock.