The main difference between a function module and a normal ABAP/4 subroutine is as follows:įunction is stored in central library and has global presence while subroutines are confined to a particular program. The R/3 system provides numerous predefined function modules that you can call from your ABAP/4 programs, and plus you can create your own function modules. Function modules are special external subroutines stored in a central library.
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