diff --git a/application/config/constants.php b/application/config/constants.php
index ae47a904..55fa4a13 100755
--- a/application/config/constants.php
+++ b/application/config/constants.php
@@ -90,6 +90,10 @@ define('PO_DELIVERED',                        'ST018');
 define('PO_CANCELLED',                        'ST019');
 define('PO_ONHOLD',                           'ST020');
 define('PO_CLOSED',                           'ST021');
+define('PO_AMENDED',                     'ST030');
+define('PO_RELEASED',                     'ST026');
+define('PO_AWAITING_RELEASE',                     'ST025');
+define('PO_APPROVED',                     'ST025');
 
 
 /* Department Code */