Invoice number

HI!
have a problem in Italian version with the label “Ricevuta” and “Fattura” at the first.
The invoice number is printed only when customer choose “Fattura” otherwise the numbering does not exist for “Ricevuta”

I can also put it to the “Ricevuta”?
Or remove the item “Ricevuta” and leave only “Fattura”?

Thank you!

Omar