diff --git a/addons/account/account_invoice.py b/addons/account/account_invoice.py
index 09b18da6e31..057947205f0 100644
--- a/addons/account/account_invoice.py
+++ b/addons/account/account_invoice.py
@@ -717,7 +717,7 @@ class account_invoice(osv.osv):
         inv = self.browse(cr, uid, id)
         cur_obj = self.pool.get('res.currency')
 
-        company_currency = inv.company_id.currency_id.id
+        company_currency = self.pool['res.company'].browse(cr, uid, inv.company_id.id).currency_id.id
         if inv.type in ('out_invoice', 'in_refund'):
             sign = 1
         else:
@@ -764,6 +764,7 @@ class account_invoice(osv.osv):
         return move_lines
 
     def check_tax_lines(self, cr, uid, inv, compute_taxes, ait_obj):
+        company_currency = self.pool['res.company'].browse(cr, uid, inv.company_id.id).currency_id
         if not inv.tax_line:
             for tax in compute_taxes.values():
                 ait_obj.create(cr, uid, tax)
@@ -777,7 +778,7 @@ class account_invoice(osv.osv):
                 if not key in compute_taxes:
                     raise osv.except_osv(_('Warning!'), _('Global taxes defined, but they are not in invoice lines !'))
                 base = compute_taxes[key]['base']
-                if abs(base - tax.base) > inv.company_id.currency_id.rounding:
+                if abs(base - tax.base) > company_currency.rounding:
                     raise osv.except_osv(_('Warning!'), _('Tax base different!\nClick on compute to update the tax base.'))
             for key in compute_taxes:
                 if not key in tax_key:
@@ -864,7 +865,7 @@ class account_invoice(osv.osv):
             ctx.update({'lang': inv.partner_id.lang})
             if not inv.date_invoice:
                 self.write(cr, uid, [inv.id], {'date_invoice': fields.date.context_today(self,cr,uid,context=context)}, context=ctx)
-            company_currency = inv.company_id.currency_id.id
+            company_currency = self.pool['res.company'].browse(cr, uid, inv.company_id.id).currency_id.id
             # create the analytical lines
             # one move line per invoice line
             iml = self._get_analytic_lines(cr, uid, inv.id, context=ctx)
@@ -1514,8 +1515,7 @@ class account_invoice_line(osv.osv):
         if context is None:
             context = {}
         inv = self.pool.get('account.invoice').browse(cr, uid, invoice_id, context=context)
-        company_currency = inv.company_id.currency_id.id
-
+        company_currency = self.pool['res.company'].browse(cr, uid, inv.company_id.id).currency_id.id
         for line in inv.invoice_line:
             mres = self.move_line_get_item(cr, uid, line, context)
             if not mres:
@@ -1660,8 +1660,7 @@ class account_invoice_tax(osv.osv):
         cur_obj = self.pool.get('res.currency')
         inv = self.pool.get('account.invoice').browse(cr, uid, invoice_id, context=context)
         cur = inv.currency_id
-        company_currency = inv.company_id.currency_id.id
-
+        company_currency = self.pool['res.company'].browse(cr, uid, inv.company_id.id).currency_id.id
         for line in inv.invoice_line:
             for tax in tax_obj.compute_all(cr, uid, line.invoice_line_tax_id, (line.price_unit* (1-(line.discount or 0.0)/100.0)), line.quantity, line.product_id, inv.partner_id)['taxes']:
                 val={}