diff --git a/addons/point_of_sale/pos.py b/addons/point_of_sale/pos.py
index 39d3a294bc7..09865f668a9 100644
--- a/addons/point_of_sale/pos.py
+++ b/addons/point_of_sale/pos.py
@@ -291,7 +291,7 @@ class pos_order(osv.osv):
         'sale_manager': fields.many2one('res.users', 'Salesman Manager'),
         'amount_tax': fields.function(_amount_all, method=True, string='Taxes', digits_compute=dp.get_precision('Point Of Sale'), multi='all'),
         'amount_total': fields.function(_amount_total, method=True, string='Total'),
-        'amount_paid': fields.function(_amount_all, 'Paid', states={'draft': [('readonly', False)]}, readonly=True, method=True, digits_compute=dp.get_precision('Point Of Sale'), multi='all'),
+        'amount_paid': fields.function(_amount_all, string='Paid', states={'draft': [('readonly', False)]}, readonly=True, method=True, digits_compute=dp.get_precision('Point Of Sale'), multi='all'),
         'amount_return': fields.function(_amount_all, 'Returned', method=True, digits_compute=dp.get_precision('Point Of Sale'), multi='all'),
         'lines': fields.one2many('pos.order.line', 'order_id', 'Order Lines', states={'draft': [('readonly', False)]}, readonly=True),
         'price_type': fields.selection([
diff --git a/addons/point_of_sale/report/pos_invoice.py b/addons/point_of_sale/report/pos_invoice.py
index ddbc8e817b3..649eb727f0c 100644
--- a/addons/point_of_sale/report/pos_invoice.py
+++ b/addons/point_of_sale/report/pos_invoice.py
@@ -34,19 +34,19 @@ class pos_invoice(report_sxw.rml_parse):
         })
         
 
-    def set_context(self, order, data, ids, report_type=None):
-        super(pos_invoice, self).set_context(order, data, ids, report_type)
+    def set_context(self, objects, data, ids, report_type=None):
+        super(pos_invoice, self).set_context(objects, data, ids, report_type)
         iids = []
         nids = []
 
+        for order in objects:
+            order.write({'nb_print': order.nb_print + 1})
 
-        order.write({'nb_print': order.nb_print + 1})
-
-        if order.invoice_id and order.invoice_id not in iids:
-            if not order.invoice_id:
-                raise osv.except_osv(_('Error !'), _('Please create an invoice for this sale.'))
-            iids.append(order.invoice_id)
-            nids.append(order.invoice_id.id)
+            if order.invoice_id and order.invoice_id not in iids:
+                if not order.invoice_id:
+                    raise osv.except_osv(_('Error !'), _('Please create an invoice for this sale.'))
+                iids.append(order.invoice_id)
+                nids.append(order.invoice_id.id)
         data['ids'] = nids
         self.datas = data
         self.ids = nids