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Proxy and Access to the backend


I've already done quite some reading on the (e)SOA topic and have some specific questions. Could somebody please explain to me the concept of the consumer and provider proxies used for SAP SOA?

I also would like to know where the actual mapping of data used in services to backend data takes place.

For example let's say you have to define a new Business Object and a new Process Component, in which step do you map your data to the backend database? Or is it somehow done by global data types? Then again, what if you have to enhance you GDTs with additional fields?

Hope someone can clear up those questions for me since all of this is still a bit confusing for me.

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