How to create a working Gateway service utilizing an Existing ECC Function Module?

Hello All,
Our ECC (Back end) has a Function module which is to be used by creating a Gateway service .Can you suggest the step by step procedure with which i can continue to expose the service?
Any help on this is much appreciated!
Thanks,
Usha

Hi Usha,
the flag 'Local app' indicates where the implementation of the service is done because it can be done on the Hub or on the backend. (see my blog about deployment options SAP Gateway deployment options in a nutshell).
If you choose 'Local App' the BEP API will be called on your hub while otherwise it will be called on the backend system to which the RFC destination points to which has been maintained in your system alias definition.
Best Regards,
Andre
This is explanation offered by SAP Help:
Indicates that the System Alias is to be used by BEP
SAP NetWeaver Gateway applications can be developed either on a SAP Business
Suite backend system or on a SAP NetWeaver Gateway hub system. To access the
business logic from an SAP Business Suite backend system the software component
IW_BEP (Backend Enablement and Event Provisioning) has to be deployed in your
system landscape. IW_BEP can be deployed on the backend system or locally on the
SAP NetWeaver Gateway hub system. Communication is handled via system aliases
(RFC destinations).
Use
Set this flag if you use this system alias for an OData Channel application
that has been developed on the BEP add-on which is deployed on the SAP NetWeaver
Gateway hub system.
In this case the system alias information (such as RFC destiation, Web
service group, software version) is not used by SAP NetWeaver Gateway to
call the BEP API (it is called locally). Instead the system alias information is
passed through to the OData Channel application, so that it could then itself
make a call to the corresponding backend system.

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