Henri-Damien LAURENT · Henri-Damien LAURENT
--- a/library/Class/Album/UsageConstraint.php
+++ b/library/Class/Album/UsageConstraint.php
    AVAILABILITY_CONSTRAINT = '07',
    ORDER_LINE_ID = 'order_line_id',
    DURATION = 'duration',
+    DURATION_UNIT = 'duration_unit',
    QUANTITY = 'quantity',
    MAX_NB_OF_USERS = 'max_number_of_users',
    ORDER_DATE = 'order_date',
-    END_DATE = 'end_date';
+    END_DATE = 'end_date',
+    UNIT_DAY = 'DAY',
+    UNIT_MONTH = 'MONTH',
+    UNIT_TO_DURATION = [ self::UNIT_MONTH => 30,
+                        self::UNIT_DAY => 1];