Honestly, not sure I'd change much.
You could have each of the SAP services in the CMDB; the end user could select the one they're putting in the ticket against; that could be put in the service field and used for assignments.
But I wouldn't change categories; they should apply regardless of the SAP system supported.
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Best start is to take it from an end user view. Can imagine they don't know all the differences. Start with an high level category/service for SAP.
You can drill down by agents based on the service or CI. When you even link them to the Client or the account you get a filtered list.