If you have a field in Invoice that reads "Tax Invoice" or "Quotation", just put that field from Invoices on your "print" layout and it will display the needed data.
That was just one option that I had already kinda fixed but was trying to make the explanation easier to understand.
What I ment to say was:
If you don't input a company name for a contact, it displays as 'No Company' in the contact list and also in the 'print' layout. I am trying to get the same area on the 'print' layout to either say the companies name when the field is populated, or have that same area say the persons full name if the company field is empty or contains 'No Company'
You could define a calculation field in Invoices. Something like:
If ( IsEmpty ( Customer::CompanyName ) or Customer::CompanyName = "No Company" ; Customer::FullName ; Customer::CompanyName )
You'll need to substitute your field names for my guesses in the actual calculaiton.