problem updating address
I'm helping a client of mine update their location in Google my Business. The business name is Roc Candy and the address listed now is 34/700 Hay Street Perth WA 6000.
Here is a link to the page business.google.com/b/115839877539582982270
When I tried to update the address to Shop 34 Piccadilly Arcade, 700 Hay Street, Perth WA 6000, it didn't work and now I'm getting a message saying "This location is a duplicate of a location that's already on Google."
I have attached a screenshot. Any ideas why I'm having this issue and how to fix it?