No output table is mapped in the Query operation

Hi,

I am making a sample of Gateway Service using the model Flight with  'BAPI_FLIGHT_GETDETAIL'. When I try to do the mapping I got the error 'No output table is mapped in the Query operation' I guess that it is because I using a Context Types in the Entity Types definition. The trouble it's resolves if I adding a additional field as a property in the Entity Types, but I'm not sure if this is correct. Can someone help me to find more information about this?.

After add the new field. It's seems fine.

Regards!!