By default, you will be able to integrate (set up a two way sync) your Zoho CRM account with only one Zoho Books’ organization.
If you wish to set it up with multiple Zoho Books organizations, please write to support[at]zohobooks[dot]com with the respective Zoho Books organization ID(s). We need to make changes in our end so that you can set up the integration of your Zoho CRM account with other (multiple) Zoho Books accounts.
Note: The two way sync can be set up only with the first Zoho Books organization which is integrated with Zoho CRM. For all the other Zoho Books organizations, Pull only sync (i.e. one way sync) can be set up.
and GST filing.