diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index f53042206..d0a1fa0f9 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -1355,7 +1355,7 @@ class AttributeLinkedSet extends AttributeDefinition
 		}
 		else
 		{
-			$bAreEquivalent = $val1->Equals($val2);
+            $bAreEquivalent = ($val2->HasDelta() === false);
 		}
 		return $bAreEquivalent;
 	}