What is the main difference between user exits and customer exits (function module exits)? What exactly can one...
do that the other can't do?
There isn't much difference between the two. CMOD user exits allow greater control, and have a manageable, trackable framework - it's easy to see what's in use and what isn't.
As we users have no control over which type of exit SAP decided to put in, and where, we just have to use whatever meets our needs.
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