Explanation/Reference:
By default, during commit operation, ADF scans each changed attribute from the current row and
compares value in the DB. If it locates changed values in DB, reports error about another user changes in
the same row. While this is expected functionality, there are use case when we want to allow commit, even
data was changed already by someone else. For example, in more complex systems, data is updated by
PL/SQL procedures, we don't want to inform user with error about this. There is a way to override lock
method in EO implementation class, catch lock error and raise lock again. This works, but there is different
way - to use Change Indicator. This property defines specific attribute to be responsible for row data
changes tracking, instead of checking every attribute. Only if Change Indicator attribute value will be
changed in DB, then current row changes will be prevented and user will be informed about someone else
changes in the same row.
References: https://blogs.oracle.com/emeapartnerweblogic/entry/
explaining_change_indicator_property_for