Toolkit
Story: SAP high-flyer gives view from the top
Not so! Microsoft has run its business for years using SAP software, and I don't think they would accept a "POS" as you call it. In fact, considering how many business rules they are processing, the SAP applications are really amazingly fast and flexible. Just imagine adding that sort of auditability, security, scalability and internationalization to your own code....
Sounds to me like you're trying to write an "outside-in" program that leverages a SAP system. The simple fact is you can't do this until you've invested serious time and money in learning about their system. I'm currently advising on a PeopleSoft CRM implementation and the learning curve is just as steep.
It *is* worth the effort to learn SAP - I know that Microsoft built quite a few company-wide applications on top of their SAP system, because they used to demonstrate them at conferences and would invite SAP prospects to Redmond to talk about how happy they were. I worked for SAP for a while - after investing my own money in training - and I know they are 100% focused on producing exactly the features and performance that top companies demand.
Good luck with your project.
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