diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 18d98ffd8a0..e6a854405fd 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -6660,6 +6660,14 @@ function complete_substitutions_array(&$substitutionarray, $outputlangs, $object
 			}
 		}
 	}
+	if (!empty($conf->global->ODT_ENABLE_ALL_TAGS_IN_SUBSTITUTIONS) {
+		// to list all tags in odt template
+		$tags = '';
+		foreach ($substitutionarray as $key => $value) {
+			$tags .= '{' . $key . '} => ' . $value ."\n";
+		}
+		$substitutionarray = array_merge($substitutionarray, array('__ALL_TAGS__' => $tags));
+	}
 }
 
 /**