Answer Posted / rams

USER EXITS are FORMS and are called by SAP standard programs
using PERFORM. CUSTOMER EXITS are FUNCTIONS so they are
called using CALL
FUNCTION (or more exactly CALL CUSTOMER FUNCTION).
Inside the form (user exit) you can read and change almost
any global data from host program. Inside a function
(customer exit) you can only acces your
import/export/changing/tables parameters.
User-exit doesn’t have any classification. In customer-
exit we have function-module exit , screen exit
, menu exit and TABLE EXITS OR CUSTOMER INCLUDES
user exits are only related to SD module and are
subroutines only where as customer exits are the
function modules which are applicable for all the
modules.

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