diff --git a/addons/stock_account/wizard/stock_valuation_history.py b/addons/stock_account/wizard/stock_valuation_history.py
index fad5a454454..1bbe5a81968 100644
--- a/addons/stock_account/wizard/stock_valuation_history.py
+++ b/addons/stock_account/wizard/stock_valuation_history.py
@@ -155,8 +155,7 @@ class stock_history(osv.osv):
                     product_template ON product_template.id = product_product.product_tmpl_id
                 WHERE quant.qty>0 AND stock_move.state = 'done' AND dest_location.usage in ('internal', 'transit')
                   AND (
-                    (source_location.company_id is null and dest_location.company_id is not null) or
-                    (source_location.company_id is not null and dest_location.company_id is null) or
+                    not (source_location.company_id is null and dest_location.company_id is null) or
                     source_location.company_id != dest_location.company_id or
                     source_location.usage not in ('internal', 'transit'))
                 ) UNION ALL
@@ -187,8 +186,7 @@ class stock_history(osv.osv):
                     product_template ON product_template.id = product_product.product_tmpl_id
                 WHERE quant.qty>0 AND stock_move.state = 'done' AND source_location.usage in ('internal', 'transit')
                  AND (
-                    (dest_location.company_id is null and source_location.company_id is not null) or
-                    (dest_location.company_id is not null and source_location.company_id is null) or
+                    not (dest_location.company_id is null and source_location.company_id is null) or
                     dest_location.company_id != source_location.company_id or
                     dest_location.usage not in ('internal', 'transit'))
                 ))