Handling Odata errors in SAPUI5

Hi Experts.

I am a newbie in SAPUI5. I have created an Odata service and in my Update method i have added the following :

RAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception

         EXPORTING

           textid  = /iwbep/cx_mgw_busi_exception=>business_error

           message = message.

How do i handle this error message in sap web ide so that the error message captured in Odata is displayed in the app. 

Thanks

Amina