Hello Kartik,
Go to MPC_EXT class and redefine DEFINE method.
Add the below code and activate the method and class.
The code is just a sample for a demo GW Model for ur reference.
Please use ur property names.
Demo GW Model ->
Code -> Go to MPC_EXT class and add the below. Activate.
super->define( ).
lo_entity TYPE REF TO /iwbep/if_mgw_odata_entity_typ,
lo_property TYPE REF TO /iwbep/if_mgw_odata_property.
lo_entity = model->get_entity_type( iv_entity_name = 'Customer' ).
IF lo_entity IS BOUND.
lo_property = lo_entity->get_property( iv_property_name = 'CustomerID' ).
lo_property = lo_entity->get_property( iv_property_name = 'mimeType' ).
lo_property = lo_entity->get_property( iv_property_name = 'Title' ).
lo_property = lo_entity->get_property( iv_property_name = 'FirstName' ).
lo_property = lo_entity->get_property( iv_property_name = 'LastName' ).
lo_property = lo_entity->get_property( iv_property_name = 'Gender' ).
lo_property->set_as_content_type( ).
ENDIF.
Clear ur model cache in /iwfnd/cache_cleanup and check again.
Regards,
Ashwin