Fix phan

htdocs/core/modules/project/modules_project.php

@@ -92,4 +92,11 @@ abstract class ModeleNumRefProjects extends CommonNumRefGenerator
 	 *  @return  string|int<-1,0>			Value if OK, 0 if KO
 	 */
 	abstract public function getNextValue($objsoc, $project);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }