org.hl7.fhir.exceptions.DefinitionException: Aggregation not supported: DocumentReference.subject at org.hl7.fhir.r5.comparison.ProfileComparer.checkAddTypeUnion(ProfileComparer.java:497) at org.hl7.fhir.r5.comparison.ProfileComparer.unionTypes(ProfileComparer.java:486) at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:207) at org.hl7.fhir.r5.comparison.ProfileComparer.compareChildren(ProfileComparer.java:307) at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:224) at org.hl7.fhir.r5.comparison.ProfileComparer.compare(ProfileComparer.java:131) at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:92) at org.hl7.fhir.igtools.publisher.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:244) at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:3755) at org.hl7.fhir.igtools.publisher.Publisher.loadConformance(Publisher.java:3681) at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:821) at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:680) at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:7939)