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First, SAP will not support customer modified objects. Having said
that, often it is necessary to make such changes to make the system behave
as required by the business. The only supported changes are those made
when applying OSS notes. I'll address the two issues seperately.
1) SAP Authorised Changes (OSS Notes etc.).
The note will document what objects need changings. You should make sure
you download all notes you have applied, and store them somewhere safe.
Having applied a note, make sure you syntax check and generate all the
objects affected by the note. For example, if an include is changed which
is part of a function group, then generate the entire function group, to
make sure it is OK syntactically.
With programs, I always include a comment header, explaining the reason for
the change, the date and the fact that it was me who changed it. Where
small areas of code are changed, I use in-line comments thus:
Inserting a line - " I 99999 MB 30/8/2001
Deleting a line - " D 99999 MB 30/8/2001
Where 99999 is the number of the note. Of course, if the note specifies a
line should be deleted, you comment it out - don't actually delete it!
For large code changes, i.e. bulk inserts and deletes, use comment blocks
to indicate what is happening.
2) Customer specific changes (Not authorised by SAP!)
Think again! Can this be achieved by changing config, business practices,
or supplied user-exits?
Follow the same rules as applying OSS notes. However, in your off-line
documentation, you must include instructions on how to apply the change -
in exactly the same way as OSS notes do.
Make minimal changes to the SAP objects. I usually put my code in a form,
which exists in a seperate include, whose name is in the customer name
space. That way, the only extra code in the SAP program is PERFORM
myclientname_meaningfulformname. (I always put the client name as the
first part of the form name for easy recognition.
Test very very thoroughly.
If you follow these standards and documentation, you will find that when
you come to upgrade your SAP system, or apply hot packages, the process
will be far smoother.
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