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Kalpana DhanajayarajKalpana Dhanajayaraj 

There are 2 external objects

There are 2 external objects Coupons and Events.I want the Event Type field in Event object to be displayed in Coupon object.I have established this using external lookup relationship and the field Event Type is displayed in Coupon record.
This is in sandbox.
Now should I create any mapping in heroku so that Event Type field in Coupon will hold the data from Event object(field name Event Type)
Kalpana DhanajayarajKalpana Dhanajayaraj
Can someone help here