pdf.php ile modification to display netto prices

Hi!
some time ago you have made some modifications to the pdf.php file for me to be able to show the netto prices on invoice. I had to than overwrite this file each time the gridbox got updated. So, it worked fine until now. Now I have a helper Problem I described here---> https://www.balbooa.com/help/forums/gridbox/ecommerce/netto-price-before-tax-and-shipping-method-on-invoice
Please, could you help me with it?

Thanks and big lov
Lukas

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