OData Deployment

Hi,

am new to NetWaever Gateway,

In HUB Architecture(NWGW connected to ECC via RFC Connection),

1) am planning to create a project in NW Gateway, design the ODATA, create service and get the data from ECC using RFCs/BOR which are built in ECC. Is this the correct deployment method?

2) can we call a class methods of business system in runtime artifacts DPC_EXT methods? or only RFC/BOR objects can be called?

Thank you

Regards,

Prashanth