Hi Vijay,
Implement IF_FPM_FEEDER_MODEL interface in your feeder class and create wire from top component (ROOT node of BO) to your own component. IO_CONNECTOR import parameter in method IF_FPM_FEEDER_MODEL~SET_CONNECTOR contains keys of parent component in wire. Just use code below to get them.
data lo_connector type ref to /BOFU/IF_FBI_CONNECTOR_BASE.
lo_connector ?= io_connector.
lt_src_keys = lo_connector->mo_source_entity->get_self_keys( lo_connector->mv_current_port ).
Kind regards, Aliaksandr.