What is Lock Objects:
The R/3 system synchronizes simultaneously access of several users to the same data records with a lock mechanism.
The lock objects always consists of key fields of the table.
LOCK MODES:
There are three types of Lock mode.
Exclusive Lock- The lock data can only be displayed or edited by a single user.A request for another exclusive lock or for a shared lock is rejected.
Shared Lock- More than one user can access the locked data at the same time in display mode.A register for another shared lock is accepted.
Exclusive but not cumulative: This can be requested several times from the same transactions.
NOTE: When we create lock object in DDIC then it automatically created two function Modules ,
with names ENQUEUE_<lock_obect_name> and DEQUEUE_<lock_object_name>.
If data records are to be locked you must call function modules ENQUEUE _<lock_object_name>
Locked data records can be unlocked by calling function module DEQUEUE_<lock_object_name>
HOW TO CREATE A LOCK OBJECTS:
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