Calls the function module func . func must
be a 3-character literal (e.g. '001')
In line with SAP's enhancement concept, function modules are delivered
empty and must be implemented by the customer (the transactions used
for this are SMOD at SAP and CMOD at the customer's).
The interface and call location are both defined by SAP.
Note
The customer can use Transaction CMOD to activate
the function module. The final name of the function module is compiled
from EXIT_ , the name of the module pool where the function
module is called, and the name func . For example, the statement
" CALL CUSTOMER-FUNCTION '001' " in the module pool SAPMS38M
calls the function module EXIT_SAPMS38M_001.
