We've purchased Zoho books and have integrated it with Zoho CRM. We are currently syncing:

Contacts (both ways)

Products

Transaction Modules (Estimates and Invoices)

Since doing this we are now getting the attached error message come up in our CRM when we try and edit any of the fields on an existing Contact. If I select the Edit button at the top right of the Contact screen I am able to make changes but if I just want to to edit a particular field the error message appears when I click Save.

If I unlink Zoho Books the error message disappears so it must be related to this in some way.

Thanks

Jo