diff --git a/org.hl7.fhir.utilities/src/main/resources/Messages.properties b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
index a5b49377c..50b380871 100644
--- a/org.hl7.fhir.utilities/src/main/resources/Messages.properties
+++ b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
@@ -640,4 +640,4 @@ CODESYSTEM_CS_NO_SUPPLEMENT = CodeSystem {0} is a supplement, so can't be used a
 CODESYSTEM_CS_SUPP_CANT_CHECK = CodeSystem {0} cannot be found, so can't check if concepts are valid 
 CODESYSTEM_CS_SUPP_INVALID_CODE = The code ''{1}'' is not declared in the base CodeSystem {0} so is not valid in the supplement
 SD_VALUE_TYPE_IILEGAL = The element {0} has a {1} of type {2}, which is not in the list of allowed types ({3})
-SD_NO_TYPES = The element {0} has no assigned types
+SD_NO_TYPES_OR_CONTENTREF = The element {0} has no assigned types, and no content reference