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CreyJ
Participant
Assuming you have the chance to start up wit a new ERP or S/4 SAP system - yes they are also still alive in an S/4 Hana -  and you can work on an untouched SAPMV45A (as example). How would you do it? What is clean (for you)?

Here are some of my thoughts – but no final conclusion. Maybe you can add yours.

  • Direct implementation in ZZ include:

    • Pros

      • Direct access to all data objects

      • Easiest way



    • Cons

      • Complete include locked by one change

      • No unit tests

      • Direct access to all data objects, when doing it wrong (ok that's always the case when doing it wrong, but ... )







  • Direct implementation using includes, one (or more) per USEREXIT form :
    Similar like direct implementation

    • Pros

      • several developers/projects can work in parallel



    • Cons

      • Looks a little bit like fake modularization, as include is not an own object

      • Tendency to grow wild. “May-be another include in or after the original include helps me with my problem?”

      • A return or check statement  leaves the subroutine and not just the include





  • External performs to programs, that share the data object with tables/common part

    • Pros:

      • Still direct access to data

      • Can have own screens

      • Implementation could be done by local classes and unit tests



    • Cons

      • External performs look like a misuse of the private objects, that are public by technical reasons.







  • Real OO with global interfaces/classes/BAdis

    • Pros

      • Advantages of OO: Encapsulation, Inheritance ..

      • “Modern” Exception handling

      • Development support by ADT

      • Unit tests



    • Cons

      • Cannot have screens

      • Frequent changes of public interface when starting with a reduced/minimal interface



    • Variants




  • How to perform the modification

    • Modification of the SAP include

      • Pros

        • Easier to transport in an running system



      • Cons

        • Needs a registry key

        • More complicated in SPAU





    • Implicit enhancement

      • Pros

        • No key needed

        • Easier in SPAU

        • Can have a different transport route than a modified SAP object
          e.g. when applying notes in a central development system



      • Cons

        • Import of an enhancement creates a new runtime object. So it cannot be imported that easy in a running system.








 

Currently my thoughts go in direction of having a program that shares the data with the master program. The call from the USEREXIT form is done by external subroutine call:

E.g. like this for USEREXIT_FIELD_MODIFICATION.
perform field_modification in program <your program> if found.

Starting point for the implementation of the custom code would be a local class, as there are easy refactoring paths to  global classes.

The modification would be done using an implicit enhancement.

Let me know your thoughts.
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