The image shows the message flow between trading partner ABC, the buyer, and trading partner XYZ, the seller, using RosettaNet PIP3A4 V02.00. Message 1, the purchase order request, is transferred from the buyer (ABC) to the seller (XYZ). Message 2, the receipt acknowledgment, is transferred from the seller (XYZ) to the buyer (ABC). Message 3, purchase order confirmation, is transferred from the seller (XYZ) to the buyer (ABC). Message 4, receipt acknowledgment is transferred from the buyer (ABC) to the seller (XYZ). End of description.