Mark invoice as "paid" within Zoho CRM

Mark invoice as "paid" within Zoho CRM

Hey,

i included our Zoho Invoice account into our Zoho CRM account and used it seperatly before.
Now i wanted to mark an Invoice as paid within Zoho CRM in the associated contact, but there is no such option.

How can i archive this without switching to Zoho invoice?

Cheers