Note: The unique order ID generated by your cart software ensures the same order isn’t tracked twice
This could be interpreted as this is unique from point of view of cart software and/or from the point of view of Matomo tracking…
Which Matomo version do you use?
@innocraft, how Matomo should work for order ids?
I saw this:
fyi: When tracking an order that has the same OrderID Matomo gives the following error: Invalid non-unique idsite/idorder combination (1, 000143), conversion was not inserted.