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what's Inside SAP?


I am an SAP functional consultant, with limited knowledge of the technical details of the system. I would like to understand SAP system on a high level. If there is any articles, documents, blogs which could help me understand the inner arrangements and workings of SAP ECC? Or answers these questions, it would be great.

1. What is the SAP system made of? I mean structurally how is it organized inside? I keep hearing function modules, programs, objects, Business objects repository etc..

2. What is a function module? And what is below or above that hierarchically ?

3. What is Business objects repository? What is its purpose?



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