Hi Avinash
Please could you download the package and make changes in eclipse for the field
To Know the service name of SAP Fiori Application go to sicf and provide the below service path.
Service Path - /sap/bc/ui5_ui5/sap choose your application name .
Go to SE38 and execute the program /UI5/UI5_REPOSITORY_LOAD with UI5 application name as what you found above in SICF and click on download and it will come to the eclipse
To extend the Odata service you need to go to SEGW and create a new odata service and test it via Tcode /IWFND/MAINT_SERVICE
Regards
Vinita