NH-2692 - The identity for values or components is the elements themselves,

so return "elements" as property name

Author: darrenkopp

src/NHibernate.Test/NHSpecificTest/NH2692/Fixture.cs

@@ -4,7 +4,7 @@
 
 namespace NHibernate.Test.NHSpecificTest.NH2692
 {
-	[TestFixture, Ignore("Not fixed yet.")]
+	[TestFixture]
 	public class Fixture : BugTestCase
 	{
 		[Test]

src/NHibernate/Hql/Ast/ANTLR/Tree/FromElement.cs

@@ -485,6 +485,10 @@ public virtual string GetIdentityColumn()
 			{
 				propertyName = EntityPersister.IdentifierPropertyName;
 			}
+			else if (IsCollectionOfValuesOrComponents)
+			{
+				propertyName = CollectionPropertyNames.Elements;
+			}
 			else
 			{
 				propertyName = NHibernate.Persister.Entity.EntityPersister.EntityID;