diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 740645c8c8e..a13af375542 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -443,13 +443,19 @@ abstract class CommonObject
 
 	public $next_prev_filter;
 
+	/**
+	 * @var array	List of child tables. To test if we can delete object.
+	 */
+	protected $childtables = array();
+
 	/**
 	 * @var array    List of child tables. To know object to delete on cascade.
-	 *               if name like with @ClassNAme:FilePathClass;ParentFkFieldName' it will
-	 *               call method deleteByParentField(parentId,ParentFkFieldName) to fetch and delete child object
+	 *               If name matches '@ClassNAme:FilePathClass;ParentFkFieldName' it will
+	 *               call method deleteByParentField(parentId, ParentFkFieldName) to fetch and delete child object
 	 */
 	protected $childtablesoncascade = array();
 
+
 	// No constructor as it is an abstract class
 	/**
 	 * Check an object id/ref exists
diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index 03fffaaba5d..9a15aa59836 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -196,7 +196,9 @@ class MyObject extends CommonObject
 	//protected $childtables = array();
 
 	/**
-	 * @var array	List of child tables. To know object to delete on cascade.
+	 * @var array    List of child tables. To know object to delete on cascade.
+	 *               If name matches '@ClassNAme:FilePathClass;ParentFkFieldName' it will
+	 *               call method deleteByParentField(parentId, ParentFkFieldName) to fetch and delete child object
 	 */
 	//protected $childtablesoncascade = array('mymodule_myobjectdet');