Call mutiple tables data in single OData service call

Hi,

We have created a ZBAPI same as standard BAPI "ALM_PM_NOTIFICATION_GETDETAIL" for creating an ODATA service. But we are facing problem while calling the data from multiple tables in a single query/entity while creating that ODATA service using SEGW.

Please guide me how can we do that or is this possible to do that.

Thanks,

Shrikant N.