Hi Doug,
Here you go.
GBAPP_APV_PO -> Class library -> Classes -> CL_GBAPP_APV_PO_RDP -> Method ->
Redefinitions -> GET_ENTITYSET and GET_EXPANDED_ENTITY
Inherited Methods -> /IWBEP/IF_MGT_CORE_SRV_RUNTIME -> READ_ENTITY*
Inherited Methods -> /IWBEP/IF_MGT_APPL_SRV_RUNTIME -> GET*
Regards,
Masa / SAP P&I Technology RIG