I've found the cause of the problem when the 'ALL immunizations' parameter is selected but the immunizations not included in the export. Unfortunately, it is something that can probably only be fixed with a patch. I've found that it also affects the 'TEST' functionality which uses the variable set via the NEW versus ALL selection. I can fix it locally on sites that specifically need it but since it will probably be quite a while before we release version 3.0, I wanted to get your thoughts as to whether we should proceed right away with a patch. Since the patch is very focused, it shouldn't be difficult to test it since it would just be that one function. I've tested the change on my own system and re-run the MU2/NIST files and they all pass which isn't surprising since the fix doesn't affect the format of the HL7 segments, just with the logic of whether to include immunizations.