I just joined the IHS call with ASIIS. They are now telling us that they can live with our current RXA-11.4 functionality for the time being. If they don't recognize RXA-11.4 for historical shots then they just blank out the value. Since they have nearly all the historical vaccinations already they think this issue does not warrant waiting months for IHS to make the fix.
I told them that my advice to IHS was to remove the value of RXA-11.4 for historical vaccinations, and that I thought it could be a change considered for some future release. My advice is to wait and change this as part of a new version, and not as a patch.