Using application or entity services as model?

Hello,
is it a bad decision to access the CRUD and findBy operations of my entity services with UI patterns?
The book "SAP xApps and the Composite Application Framework" says, only application services should be used to handle with the UI, according to the MVC principles. But in carpool examples also entity services are used. So why should I map the needed entity service operations to application services?
What is the pro and contra?
Thanks and regards
Joschi

Hello Joachim,
I would also add that when the book states that "only application services should be used to handle the UI", the main point is that no business logic should be put in the UI and it should only be put in the application service. Once business logic is put in the UI, then you can not web service enable this logic. So in general, all business logic should be put in the Application Service.
If there is no business logic between the UI and the Entity (like in the carpool example), then there is no need to create a redundant application service. Since it is impossible to put business logic in the CAF UI Patterns, they can always directly call Entity Services without violating this design principle.
Regards,
Austin.

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Message was edited by:
        Chandan Jash

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award points if info is helpful
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=======================================
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Message was edited by:
Felix Japs

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