Duplicate Customer Name

I have been trying Zoho Invoice and it is an excellent tool for me.

However i have run into one problem. I work in a local area and i will find that i will have customers with the same name.

Zoho does not allow me to create a new customer with the same name.

I have tried a diffrent invoicing service and they allow duplicate names and you verify the customer by there address.

How are you tackling this issue?