We have made a fix to the 'admin_invoice_pdf.php' and 'user_invoice_pdf.php' files after release 3.2 has been issued.
 
Description.
There was notices about undefined constants on invoices pages.
 
Solution.
Please download an updated version of the files from here:
http://www.viart.com/downloads/admin_invoice_pdf-3.2.zip
http://www.viart.com/downloads/user_invoice_pdf-3.2.zip
Then extract the 'admin_invoice_pdf.php' file into the 'admin' folder and 'user_invoice_pdf.php' into the root folder of your shop replacing an existing ones.
Don't forget to make a backup copy of the current file in case something goes wrong.