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Why do we use Function Modules?

Why do we use Function Modules if the same function is performed by Subroutines?
It is true that much of what you can do with Function Modules, you could do with Subroutine Pools. The advantages of Function Modules is that they can be called from external systems (RFC), they can be called in different modes (Update task, etc.), they can share data within their groups, they clearly present and have documented their interfaces...etc. If your code is only used within your program, then use a Subroutine. Otherwise a function module is preferred.
This was last published in June 2004

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