Difference between a Function Module and a Subroutine in SAP ABAP

Function modules and subroutines are key elements in SAP ABAP programming, but they have some key differences:

• Function Module:

A function module is a self-contained program that performs a specific task and can be called from any program within the SAP system. It has its own interface and can be executed independently.

• Subroutine:

A subroutine is a reusable set of program statements that are part of a main program or function module. It is not a standalone program and cannot be called independently.

In summary, function modules are standalone programs that can be called from anywhere, while subroutines are reusable blocks of code within a larger program.