diff --git a/core/ormlinkset.class.inc.php b/core/ormlinkset.class.inc.php
index af31e69f2..e44060dce 100644
--- a/core/ormlinkset.class.inc.php
+++ b/core/ormlinkset.class.inc.php
@@ -179,7 +179,7 @@ class ormLinkSet implements iDBObjectSetIterator, Iterator, SeekableIterator
 		assert($oLink instanceof $this->sClass);
 
 		$iObjectId = $oLink->GetKey();
-		if (array_key_exists($iObjectId, $this->aPreserved)) {
+		if (array_key_exists($iObjectId, $this->aPreserved) && !$oLink->Equals(MetaModel::GetObject(get_class($oLink), $iObjectId, true))) {
 			unset($this->aPreserved[$iObjectId]);
 			$this->aModified[$iObjectId] = $oLink;
 			$this->bHasDelta = true;