If you want to use your own header and footer when printing documents, you can do so by applying a background. This can be done under: Settings —> Your company by clicking on "+" Add report background.”
You can upload multiple backgrounds for different documents and situations. It is important to follow these criteria: The graphic must have a minimum resolution of 1654×2339 pixels and be in the RGB color model.
When designing the background graphic for reports, make sure to adhere to report standards, leaving space at the top for the header, space at the bottom for the footer and optionally a watermark featuring your company’s design or logo;
If you are printing invoices with UPN forms, please note that the lower third of the page is the UPN form, so use only the header in your graphic;
The graphics then upload to Metakocka and disable output in the settings (Select "Do not display company data on reports").
When you want to print the document, select the PDF invoice in the output dialog and choose the background:
The examples of backgrounds can be found in the attached file: OzadjaMK
In additional settings, you can specify when a particular background can be set: Automatic determination of background based on country/online store