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Unlocking and Locking Master Data 
Use
All employees assigned to the entry object you use to enter shift planning can be used in your shift plan. The master data of this employee is then locked to prevent further processing in other components. For more information, refer to the IMG for Shift Planning under Lock Setting. This prevents other users from changing data you are currently working on.
You can, however, unlock master data so that other users have access to the data records, for example, to update data relevant for accounting.
Procedure
Unlocking User Master Data
The system unlocks the master data of the employee. A symbol appears next to the name of the employee whose record is now unlocked.

Before you can make any new changes to the data record of the employee, you have to lock the master data again.
Locking User Master Data
The system locks the master data of the employee. The "unlocked" symbol next to the name of the employee whose master record is now locked disappears.
Result
You have either locked or unlocked the employee currently involved in shift planning from additional data maintenance or editing in other areas.
