Hi Ashwin,
Currently it is not possible as per OData V2 standard. So Gateway does not support it at the moment.
However what you can do is to convert the table into a string and pass it with a custom HTTP header. Then in Data provider class you receive the custom header and parse to get the table. You can read the header using follwing code
mo_facade ?= /iwbep/if_mgw_conv_srv_runtime~get_dp_facade( ). lt_client_headers = mo_facade->get_request_header( ).
Then from the DPC you can call your RFC.
This is not a very elegant way of doing it, but you may give it a shot.
Regards,
Atanu