B2B receives a Purchase Order Transaction Set (850) on your behalf. When our Run Connectors process or job is run, we write this into Macola as an O-type Order. Eventually, this order will be invoiced, shipped, and posted in Macola at which point, the Run Connectors process/job is run again. At this point, we then tell B2B that their purchase order has been invoiced so that B2B can send ship notices (856) and invoices (810) on your behalf as needed or configured.
Note that when we download the B2B order into Macola, we use the next order number from Macola Order Entry Setup to assign the order number.