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I think it's because you used \ instead of / in the family code line.
So let's say you bought a license for an open truck paying full price, then if you want to buy a covered variant of the same model (IF they are part of the same family), you get to pay a discounted rate for that.
Should be something like:
$FAMILY 2874343145/t805_open
What do you think about the Unimog?
https://www.google.com/search?q=unimog&sxsrf=ALiCzsbM3yNKwmKgxlnquk_Y0UPxfVs36g:1665864728544&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjo2Y3bheP6AhWdgGMGHcmzAY0Q_AUoAXoECAEQAw&biw=1920&bih=955&dpr=1
Or them bigger brother BX