diff --git a/addons/sale_margin/sale_margin.py b/addons/sale_margin/sale_margin.py
index dc8c4dfff3c..72d252a7c11 100644
--- a/addons/sale_margin/sale_margin.py
+++ b/addons/sale_margin/sale_margin.py
@@ -31,11 +31,15 @@ class sale_order_line(osv.osv):
             lang=lang, update_tax=update_tax, date_order=date_order, packaging=packaging, fiscal_position=fiscal_position, flag=flag, context=context)
         if not pricelist:
             return res
+        if context is None:
+            context = {}
         frm_cur = self.pool.get('res.users').browse(cr, uid, uid).company_id.currency_id.id
         to_cur = self.pool.get('product.pricelist').browse(cr, uid, [pricelist])[0].currency_id.id
         if product:
             purchase_price = self.pool.get('product.product').browse(cr, uid, product).standard_price
-            price = self.pool.get('res.currency').compute(cr, uid, frm_cur, to_cur, purchase_price, round=False)
+            ctx = context.copy()
+            ctx['date'] = date_order
+            price = self.pool.get('res.currency').compute(cr, uid, frm_cur, to_cur, purchase_price, round=False, context=ctx)
             res['value'].update({'purchase_price': price})
         return res