We noticed that same Contact Id is allocated to all vendors imported into zoho books 

Also, noticed that exporting invoices, estimates to csv file also has same reference in Invoice ID, Customer ID and Product ID.

First issue is noticed on the paid account and second is on the trial account.  We can't create Invoices, Estimates, Bills and Expenses via API with duplicate IDs.

Is this specific to account setup or an error in import feature?

Thanks