How can I set a filter for my GET_ENTITY

Hi

Would it be possible to set a filter (or similar) for my GET_ENTITY, so I can decide my output.

Maybe so I only show my line 20 or what I put into my "filter"..

/sap/opu/odata/sap/ZGW_xxxxxxx_SRV_03/OrdDetSet('000010025783')

Thanks

Lars