diff --git a/hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/DomainModelHelper.java b/hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/DomainModelHelper.java
index 259a394a8b..c1aef741a1 100644
--- a/hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/DomainModelHelper.java
+++ b/hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/DomainModelHelper.java
@@ -12,7 +12,9 @@ import org.hibernate.graph.spi.SubGraphImplementor;
 import org.hibernate.metamodel.MappingMetamodel;
 import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.MappingModelHelper;
+import org.hibernate.metamodel.mapping.ModelPart;
 import org.hibernate.metamodel.model.domain.EmbeddableDomainType;
+import org.hibernate.metamodel.model.domain.EntityDomainType;
 import org.hibernate.metamodel.model.domain.JpaMetamodel;
 import org.hibernate.metamodel.model.domain.ManagedDomainType;
 import org.hibernate.metamodel.model.domain.PersistentAttribute;
@@ -61,18 +63,44 @@ public class DomainModelHelper {
 		if ( attribute1 == attribute2 ) {
 			return true;
 		}
-		final MappingMetamodel mappingMetamodel = jpaMetamodel.getMappingMetamodel();
-		final EntityMappingType entity1 = mappingMetamodel.getEntityDescriptor(
-				attribute1.getDeclaringType().getTypeName()
+		final MappingMetamodel runtimeMetamodels = jpaMetamodel.getMappingMetamodel();
+		final ModelPart modelPart1 = getEntityAttributeModelPart(
+				attribute1,
+				attribute1.getDeclaringType(),
+				runtimeMetamodels
 		);
-		final EntityMappingType entity2 = mappingMetamodel.getEntityDescriptor(
-				attribute2.getDeclaringType().getTypeName()
+		final ModelPart modelPart2 = getEntityAttributeModelPart(
+				attribute2,
+				attribute2.getDeclaringType(),
+				runtimeMetamodels
 		);
+		return modelPart1 != null && modelPart2 != null && MappingModelHelper.isCompatibleModelPart(
+				modelPart1,
+				modelPart2
+		);
+	}
 
-		return entity1 != null && entity2 != null && MappingModelHelper.isCompatibleModelPart(
-				entity1.findSubPart( attribute1.getName() ),
-				entity2.findSubPart( attribute2.getName() )
-		);
+	static ModelPart getEntityAttributeModelPart(
+			PersistentAttribute<?, ?> attribute,
+			ManagedDomainType<?> domainType,
+			MappingMetamodel mappingMetamodel) {
+		if ( domainType instanceof EntityDomainType<?> ) {
+			final EntityMappingType entity = mappingMetamodel.getEntityDescriptor( domainType.getTypeName() );
+			return entity.findSubPart( attribute.getName() );
+		}
+		else {
+			ModelPart candidate = null;
+			for ( ManagedDomainType<?> subType : domainType.getSubTypes() ) {
+				final ModelPart modelPart = getEntityAttributeModelPart( attribute, subType, mappingMetamodel );
+				if ( modelPart != null ) {
+					if ( candidate != null && !MappingModelHelper.isCompatibleModelPart( candidate, modelPart ) ) {
+						return null;
+					}
+					candidate = modelPart;
+				}
+			}
+			return candidate;
+		}
 	}
 
 	public static <J, S> ManagedDomainType<S> findSubType(ManagedDomainType<J> type, Class<S> subtype) {