Why am I unable to add more custom fields in the Deals module?

In the One Pilot edition of Vtiger CRM, the Deals module supports only up to 2 custom fields, which limits the ability to add additional fields.
To create more custom fields, you will need to use the One Growth edition, which allows up to 10 custom fields in the Deals module. This expanded limit provides flexibility to add all required custom fields based on your business needs.