Hi Bill!
Try this:
Not(Exists("ValidAdt", HL7.{MSH:9.2}))
Lori
More on this - turns out that Extension fields need to be enclosed in an <Extension> element, like so:
<Allergy>
<Extension>
<Mode>SNAPSHOT</Mode>
<OnsetDate>20170412113619</OnsetDate>
<AllergyType>ALLERGY</AllergyType>
<AllergyStatus>ACTIVE</AllergyStatus>
<Asserter>10262187</Asserter>
</Extension>
<AllergyCategory>
<Code>DA</Code>
</AllergyCategory>
<Allergy>
<SDACodingStandard>DRUG</SDACodingStandard>
<Code>d00116</Code>
<Description>penicillin</Description>
</Allergy>
<Severity>
<Code>SEVERE</Code>
</Severity>
<DiscoveryTime>2017-04-12T00:00:00Z</DiscoveryTime>
<FromTime>2017-04-12T00:00:00Z</FromTime>
<Status>A</Status>
<EnteredAt>
<Code>UHC</Code>
</EnteredAt>
</Allergy>
Thanks, David. I did a clean install of 2021.1 and now I see it. (This is a local install, for demos only - I wouldn't try loading anything from a different version into HealthShare at a customer site.)