Lock Concept

The SAP System is equipped with a special lock mechanism that synchronizes access to data on the database. The purpose of the lock mechanism is to prevent two transactions from changing the same data on the database simultaneously.

Using T CODE SM12 we can check list of locked object for respective users:

Provide User ID then Press enter key and check locked object list as below:

 

Select entry and delete irrespective locked objects. Please make sure data must be save else unsaved data will be lost..