Every line carries the German original plus Korean and English wording. You talk to the tax office in Zeile and Kennziffer, and read the same line in your own language.
The German text stays exactly as the official form has it. Korean and English explain what the line is asking. These are written and maintained, not machine translated.
That way documents leave the building in German, while the screen stays readable inside it.
Anything you will meet on a tax office letter or in a call with your adviser keeps its German name, with the English term in front of it.
Output VAT is Umsatzsteuer. The same wording carries through account mapping and the return.
German contract wording is kept as it appears on the paperwork.
And Summenmussfeld for totals. Taxonomy terms are carried alongside rather than replaced.
The German tax adviser sees German terms and head office in Seoul sees the same document in Korean. No second bookkeeping system, no translation by spreadsheet.
Only the display changes language. Everything is booked once and the documents stay in the original.