SAP FUNCTION MODULE EXIT GLOSRY documentation, setup help and example usage

ARTICLE

function module exit
Customer exit for ABAP programs in the form of empty or partially implemented function modules
delivered with the standard SAP system. Incorporated in ABAP programs using the statement CALL CUSTOMER-FUNCTION . The function module
interfaces are predefined by SAP. The implementation can be empty or partially predefined. The customer must fully implement and activate them using transaction
CMOD . We recommend replacing function module exits by BAdI s.