Enable Print option in Manual Customer Invoice window

Hello,
Manual customer invoice is a window to register in the system customer invoice created externally. We can assume this invoice is printed already and definitive invoice number is given. There is no print option available for such an invoice - IFS system is not he one creating it.

If you want to print invoice from IFS system without referencing any other object (like customer order or sales contract) - Instant invoice is an option to use.