[-] BO: This is now not possible to move a tab with id_parent = 0 to an another tab

controllers/admin/AdminTabsController.php

@@ -159,7 +159,16 @@ class AdminTabsControllerCore extends AdminController
 					),
 					'desc' => $this->l('Show or hide menu.')
 				),
-				array(
+			),
+			'submit' => array(
+				'title' => $this->l('   Save   '),
+				'class' => 'button'
+			)
+		);
+		
+		if (!Validate::isLoadedObject($this->object) || $this->object->id_parent > 0)
+		
+		$this->fields_form['input'][] = array(
 			'type' => 'select',
 			'label' => $this->l('Parent:'),
 			'name' => 'id_parent',
@@ -168,12 +177,6 @@ class AdminTabsControllerCore extends AdminController
 				'id' => 'id_tab',
 				'name' => 'name'
 			)
-				)
-			),
-			'submit' => array(
-				'title' => $this->l('   Save   '),
-				'class' => 'button'
-			)
 		);
 
 		return parent::renderForm();