I have been using Zoho CRM for years and have about 15,000 contacts. I have old invoices from the years before I used Zoho that I want to import.

I tried importing the invoices, and it works, but nothing gets imported in the Contact Name lookup field -- it just stays blank and doesn't get associated with a Contact.

Is there a way to do this without having to migrate (and therefore duplicate) 15000 contacts?

Importing Invoices that aren't connected to Contacts is not useful at all. Please advise.