Do I really have to use Zoho Reports (and pay 50$ a month) to create a report containing elements from Potentials and Invoice module?

Do I really have to use Zoho Reports (and pay 50$ a month) to create a report containing elements from Potentials and Invoice module?

We are currently using Zoho CRM and I can create custom reports. But not, it seems, custom reports that are useful to us. Do we really have to use Zoho Reports (and pay 50$ a month) to create a report containing elements from both the Potentials and the Invoice module?  Or am I missing something here? Thanks!