Problem with VAT

Hello everybody,

i have a problem with the PDF Invoice. When i have a product with 19% the detail site is correct. After i export the invoice to PDF with aos_products_quotes_vat I’m getting always 0%. So what is wrong? Can anybody help me? Thanks.

Another questions: is it possible to have a own paper size? Actually (7.9.3) there is no change, when i change the dropdown from a4 to letter for e.g.

Thank you.
Best regards

The papersize problem seems to be an bug: