Section 7.3.5 says ". If the receiver finds an existing order, it should return the Placer ID to the sender in the ORC segment of an OML^O21 message." - presumably this is describing an application level Ack to the ORU^R31 message, but the Ack Choreography table in the section only shows ACK^R31^ACK as the application Ack. This seems wrong.

There is a similar issue with Section 7.3.6 (but an ORA message). 

All sections should be examined for a full and correct Ack Choreography.