GS1 codes purchase invoice – how to enter it?

That seems to me to be a variable cost? By that I mean: the more trade goods (products) you buy, the more of those barcodes you need?

Is my assessment correct?

If so, those barcodes are part of your trade goods and you can record those purchases under trade goods. It's not a disaster if you record it under general expenses, because I suspect that the cost price will not be that high and the impact of those purchases on your accounts will be limited overall.

But I would estimate that they can be included with your trade goods.

These are relief goods and can best be processed under class 60 trade goods, possibly generating an additional code there; this way, a correct margin can be determined if necessary. Anything related to costs directly related to the sold goods can best be placed under this heading.

Great! Thank you!