Hi Bob,
Based off of your screenshots it appears that you are making reference to ISO 20022 version 3 which is not currently supported in Dynamics GP, we currently only support ISO 20022 version 1. I would encourage you to enter a product suggestion for this option to be added as a feature request for future releases of GP. You can do so at the following CONNECT site:
experience.dynamics.com/.../
I have included the link above to the MS Connect product suggestion database that is read directly by our Product Management Team. They do read each suggestion and triage it according to a priority scale. The suggestions will stay in the database to be read by others and can be voted on. The more votes it gets, the higher up in priority it will go over time.