So that’s mandatory?
I just took the openEHR-EHR-OBSERVATION.demo.v1 archetype and stuck it into a openEHR-EHR-COMPOSITION.encounter.v1. Just for testing purposes.
Looking again at the exception the issue is the interval itself is null, it should be a DV_INTERVAL<DV_QUANTITY> causing the issue. I’ll look at this ASAP.