diff --git a/setup/modelfactory.class.inc.php b/setup/modelfactory.class.inc.php
index 3ef265935..fe84b3603 100644
--- a/setup/modelfactory.class.inc.php
+++ b/setup/modelfactory.class.inc.php
@@ -1466,7 +1466,7 @@ EOF
 		switch ($sAlteration) {
 			case '':
 				if ($oNodeClone->hasAttribute('id')) {
-					$oNodeClone->setAttribute('_delta', 'merge');
+					//$oNodeClone->setAttribute('_delta', 'merge');
 				}
 				break;
 			case 'added':
diff --git a/tests/php-unit-tests/unitary-tests/setup/ModelFactoryTest.php b/tests/php-unit-tests/unitary-tests/setup/ModelFactoryTest.php
index dde120f63..f5eff7661 100644
--- a/tests/php-unit-tests/unitary-tests/setup/ModelFactoryTest.php
+++ b/tests/php-unit-tests/unitary-tests/setup/ModelFactoryTest.php
@@ -1373,7 +1373,7 @@ XML
 				'sExpectedXMLDelta' => <<<XML
 <?xml version="1.0" encoding="UTF-8"?>
 <root_node>
-	<james_bond  id="Sean" _rename_from="Roger" _delta="merge"/>
+	<james_bond  id="Sean" _rename_from="Roger"/>
 </root_node>
 XML
 			],
@@ -1389,7 +1389,7 @@ XML
 				'sExpectedXMLDelta' => <<<XML
 <?xml version="1.0" encoding="UTF-8"?>
 <root_node>
-	<james_bond  id="Sean" _rename_from="Roger" _delta="merge">
+	<james_bond  id="Sean" _rename_from="Roger">
     <subtree _delta="define">etc.</subtree>	
 </james_bond>
 </root_node>