I am a using the Zoho CRM Enterprise edition, currently I am trying to setup multiple checkbox fields in the subscriptions area of the CRM page I am building however, I am receiving an alert that I am only allowed 20 custom checklist fields in Contacts when I am supposed to have 150 custom fields in the Enterprise Edition. How can this be increased, we are switching from another CRM and we can't have this limitation, please respond ASAP.