diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index f7e1e7d..d2573df 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -4,6 +4,7 @@ from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Bool, Eval, Id, If, PYSONEncoder
 from trytond.model import (ModelSQL, ModelView)
+from trytond.i18n import gettext
 from trytond.wizard import Button, StateTransition, StateView, Wizard, StateAction
 from trytond.transaction import Transaction, inactive_records
 from decimal import getcontext, Decimal, ROUND_HALF_UP