giveaway via social media

Based on my previous experience, it is sufficient to create an invoice for €0 or with a 100% discount, stating the promotion.

Hello,

We have made a video about your topic, which you can find here: https://vimeo.com/1025193986/c44ac27673</

Here we are talking about transferring the cost to another cost category. From trade goods to advertising. That is also an option :)

But the user above is talking about creating an invoice for 0 euro. That is also possible, then you have also indicated that those trade goods have been given a different destination!