In Zoho CRM our Leads module uses the 'Last Name' field as the required Primary Key. We also have a lookup field in the Lead module for 'Contact' that links the Lead to a Contact. So there is a duplication in our Lead module because it requires the contact name twice; once for the required Primary Key, and a second time to link to a Contact. 

Instead, we would like to change the Primary Key to 'Project Name'. Each value for 'Project Name' is unique so I don't think it should be a problem. Is it possible to do this? 

Thanks for your help!

Rachel