Updated by HDMA’s eCommerce Task Force, the 855 Purchase Order Acknowledgement Guidelines for EDI support the order-to-cash cycle. In this release, codes have been edited at the line level to indicate acceptance, rejection or backorder of an item. GTIN® (Global Trade Item Number®) and GLN (Global Location Number) identifiers from GS1 US also have been incorporated, as well as various other clarifying codes or usage notes. Business use case examples have been updated from prior versions. These guidelines were developed with the application of the Accredited Standards Committee (ASC) X12 standards, version 4010.