diff --git a/htdocs/core/class/commonobjectline.class.php b/htdocs/core/class/commonobjectline.class.php
index c3c8d823a34..7f81c85fa23 100644
--- a/htdocs/core/class/commonobjectline.class.php
+++ b/htdocs/core/class/commonobjectline.class.php
@@ -28,6 +28,12 @@
  */
 abstract class CommonObjectLine extends CommonObject
 {
+	/**
+	 * Id of the line
+	 * @var int
+	 */
+	public $rowid;
+
 	// TODO
 
 	// Currently we need function at end of file CommonObject for all object lines. Should find a way to avoid duplicate code.