diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index 001e714..6f26120 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -696,6 +696,7 @@ class ValuationBase(ModelSQL):
         Date = Pool().get('ir.date')
         Currency = Pool().get('currency.currency')
         FeeLots = Pool().get('fee.lots')
+        LotQt = Pool().get('lot.qt')
         #if line is matched with sale_line we should add the open sale side
         sale_lines = line.get_matched_lines() or []
         sale_open_lots = tuple(