Hi,
I try to setup an internal trade between company A & B where company A (site 1) is the buyer and company B (site 1) is the seller.
I can create purchase from A and send it to B but in Incoming customer orders there is something missing. I´ve seen in the community that this is a common error message and I´ve tried everything that was suggested but it is not picking up the customer. In the picture below I added customer manually but still gets an error message.

Is there some sort of check list on setting up internal trade as there are quite a lot to tweek to make it work :)
Thanks!
/Emma