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Using different RFC's in one Application / Entity Service?

Update:10-11Source: network consolidation
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Hello *,
I just want to create my first Composite Application Service but before I begin I have some questions.
The service will read out material master data from PLM. For that it has some findBy-operations with full-text search (creationDate, MatNr. ...) which return a result list and one operation which returns the material object for a given MatNr.
For this operations I need to call different RFC's which are imported by external services.
Now my questions:
1. What kind of service should wrap my external services and provide the operations? Should I use one or more entity service to wrap external services and then realize the operations in an application service? Or should I just take an application service without entity services?
2. The created service should not only be an internal CAF  service but also a Web service? How can I realize this?
Thanks for your answers.
Best regards
Joschi

The Best Answer

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Ok, thanks a lot. So nearly everything's clear now. Only one question remains:
> 6. mark the entity service as "remote" and create a
> web service from it
> (note: this requires NW04s SP8)
Is this possible? I can't find any checkbox to mark an entity service as "remote" like in an application service (NWDS 7.0.07 and NW04s SP8).
So I have to map the findBy operations to an application service and create a web service from it!?
Regards
Joschi
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