How to make a field appear in drag&drop list in print editor

[Alex_Wolff]

Here is the link to the new topic:

Problem displaying form data in print-templates - make variables from Master available in print-templates

As asked i make a new topic with my requirement and post some screenshots. Basically what i want is easy and works with many other variables/entries but for some reason this one makes problems. I have to say that i didnt setup the software, the company uses it since 1-2 years now and I just started 2 days ago here. All the doctypes and fields were already setup, if right or not i cannot really tell at this time. So now to the problem. I want to display Supplier Info, like tax_id and address in…