Ability to access tickets from other stores in an enterprise

We have a chain of retail stores. They accept returns at any location regardless of which store it was purchased at.

The issue they have is that when trying to refund they are not able to access the ticket info from the store it was purchased. They are asking for a way to be able to pull up ticket info from other enterprise stores in the POS.
I currently have them logging in to the enterprise account back office to find the tickets. but they want to be able to do it all through the POS on the ipad.