diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index bea23cf..31baedb 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -1256,6 +1256,7 @@ class ValuationBase(ModelSQL):
         Date = Pool().get('ir.date')
         Currency = Pool().get('currency.currency')
         FeeLots = Pool().get('fee.lots')
+        LotQt = Pool().get('lot.qt')
 
         for lot in cls._valuation_lots(sale_line):
             if cls._ignore_empty_open_fee_lot(lot):