You can use the functionality of Master data Lock or you can user status to define your own influences on the particular business transaction and authorization key to process it.
Can you please elaborate on master data lock..Is it possible that the field itself becomes uneditable rather than giving message after changes have been done.
Master data lock can be used with reference to the object selected, by going to editstatus-Lock----- master data, by selecting this, all the data (like fields present with respect that object, excluding cost planning, budgeting, account assignment) pertaining to the object will be locked and you wouldn't be able to make changes to those fields.
Now, coming to automating of this lock can be done through using user status, when you set that user status, all the master data will locked.
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