context PolicyActivity
inv: self.participant->size()=1 and 
self.participant->forAll(part : POCDMT000040Participant2 | 	
		part.participantRole.oclIsUndefined() or
		(not part.participantRole.nullFlavor.oclIsUndefined()) or
		(
			not part.participantRole.code.oclIsUndefined() and 
			part.participantRole.code.nullFlavor.oclIsUndefined() and 
			not part.participantRole.code.code.oclIsUndefined() and
			not part.participantRole.code.codeSystem.oclIsUndefined() and
			not part.participantRole.code.displayName.oclIsUndefined()	and 
			part.participantRole.code.matchesValueSetWithDisplayName('2.16.840.1.113883.1.11.19809', part.participantRole.code.code, part.participantRole.code.codeSystem, part.participantRole.code.codeSystemName, part.participantRole.code.displayName )		
			)
		)