diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 54d167d5fa1..0ad39fca4f8 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -226,7 +226,6 @@ class purchase_order(osv.osv):
         'create_uid':  fields.many2one('res.users', 'Responsible'),
         'company_id': fields.many2one('res.company','Company',required=True,select=1, states={'confirmed':[('readonly',True)], 'approved':[('readonly',True)]}),
         'journal_id': fields.many2one('account.journal', 'Journal'),
-
     }
     _defaults = {
         'date_order': fields.date.context_today,
diff --git a/addons/purchase/wizard/purchase_line_invoice.py b/addons/purchase/wizard/purchase_line_invoice.py
index 051441d1095..b8ee4b69a32 100644
--- a/addons/purchase/wizard/purchase_line_invoice.py
+++ b/addons/purchase/wizard/purchase_line_invoice.py
@@ -64,7 +64,6 @@ class purchase_line_invoice(osv.osv_memory):
 
 
             def make_invoice_by_partner(partner, orders, lines_ids):
-
                 """
                     create a new invoice for one supplier
                     @param partner : The object partner
diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index d519db7e02a..210e4dd3be6 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -212,7 +212,7 @@ class sale_order(osv.osv):
             ], 'Create Invoice', required=True, readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
             help="""This field controls how invoice and delivery operations are synchronized."""),
         'pricelist_id': fields.many2one('product.pricelist', 'Pricelist', required=True, readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, help="Pricelist for current sales order."),
-        'currency_id': fields.many2one('res.currency','Currency', readonly=True, required=True,states={'draft': [('readonly', False)],'sent': [('readonly', False)]}),
+        'currency_id': fields.related('pricelist_id', 'currency_id', type="many2one", relation="res.currency", string="Currency", readonly=True, required=True),
         'project_id': fields.many2one('account.analytic.account', 'Contract / Analytic', readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, help="The analytic account related to a sales order."),
 
         'order_line': fields.one2many('sale.order.line', 'order_id', 'Order Lines', readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}),
@@ -258,8 +258,7 @@ class sale_order(osv.osv):
         'shop_id': _get_default_shop,
         'partner_invoice_id': lambda self, cr, uid, context: context.get('partner_id', False) and self.pool.get('res.partner').address_get(cr, uid, [context['partner_id']], ['invoice'])['invoice'],
         'partner_shipping_id': lambda self, cr, uid, context: context.get('partner_id', False) and self.pool.get('res.partner').address_get(cr, uid, [context['partner_id']], ['delivery'])['delivery'],
-        'note': lambda self, cr, uid, context: self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.sale_note,
-        'currency_id': lambda self, cr, uid, context: self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.currency_id.id
+        'note': lambda self, cr, uid, context: self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.sale_note
     }
     _sql_constraints = [
         ('name_uniq', 'unique(name, company_id)', 'Order Reference must be unique per Company!'),
@@ -385,7 +384,7 @@ class sale_order(osv.osv):
             'partner_id': order.partner_invoice_id.id,
             'journal_id': journal_ids[0],
             'invoice_line': [(6, 0, lines)],
-            'currency_id': order.currency_id.id,
+            'currency_id': order.pricelist_id.currency_id.id,
             'comment': order.note,
             'payment_term': order.payment_term and order.payment_term.id or False,
             'fiscal_position': order.fiscal_position.id or order.partner_id.property_account_position.id,
diff --git a/addons/sale/sale_view.xml b/addons/sale/sale_view.xml
index d1826da02c1..e24a6e45fe0 100644
--- a/addons/sale/sale_view.xml
+++ b/addons/sale/sale_view.xml
@@ -163,7 +163,7 @@
                             <field name="shop_id" groups="base.group_no_one" on_change="onchange_shop_id(shop_id, context)" widget="selection"/>
                             <field name="client_order_ref"/>
                             <field domain="[('type','=','sale')]" name="pricelist_id" groups="product.group_sale_pricelist" on_change="onchange_pricelist_id(pricelist_id,order_line)"/>
-                            <field name="currency_id" groups="base.group_multi_currency"/>
+                            <field name="currency_id" invisible="1"/>
                         </group>
                     </group>
                     <notebook>
diff --git a/addons/sale/wizard/sale_line_invoice.py b/addons/sale/wizard/sale_line_invoice.py
index 06aae9ea6d5..3b04319f5c7 100644
--- a/addons/sale/wizard/sale_line_invoice.py
+++ b/addons/sale/wizard/sale_line_invoice.py
@@ -68,7 +68,7 @@ class sale_order_line_make_invoice(osv.osv_memory):
                 'account_id': a,
                 'partner_id': order.partner_invoice_id.id,
                 'invoice_line': [(6, 0, lines)],
-                'currency_id' : order.currency_id.id,
+                'currency_id' : order.pricelist_id.currency_id.id,
                 'comment': order.note,
                 'payment_term': pay_term,
                 'fiscal_position': order.fiscal_position.id or order.partner_id.property_account_position.id,
diff --git a/addons/sale/wizard/sale_make_invoice_advance.py b/addons/sale/wizard/sale_make_invoice_advance.py
index 68446778323..4cb00245ade 100644
--- a/addons/sale/wizard/sale_make_invoice_advance.py
+++ b/addons/sale/wizard/sale_make_invoice_advance.py
@@ -141,7 +141,7 @@ class sale_advance_payment_inv(osv.osv_memory):
                 'account_id': sale.partner_id.property_account_receivable.id,
                 'partner_id': sale.partner_invoice_id.id,
                 'invoice_line': [(0, 0, inv_line_values)],
-                'currency_id': sale.currency_id.id,
+                'currency_id': sale.pricelist_id.currency_id.id,
                 'comment': '',
                 'payment_term': sale.payment_term.id,
                 'fiscal_position': sale.fiscal_position.id or sale.partner_id.property_account_position.id