diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 2350e21dc35..447d26b3c6d 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -960,7 +960,7 @@ class AccountInvoice(models.Model):
         recs = self.browse(cr, uid, ids, context)
         pay_journal = self.pool.get('account.journal').browse(cr, uid, pay_journal_id, context=context)
         writeoff_acc = self.pool.get('account.account').browse(cr, uid, writeoff_acc_id, context=context)
-        return recs.pay_and_reconcile(pay_journal, pay_amount, date, writeoff_acc)
+        return AccountInvoice.pay_and_reconcile(recs, pay_journal, pay_amount, date, writeoff_acc)
 
     @api.multi
     def _track_subtype(self, init_values):
diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 6fdcf5cc8b8..3838b6a830e 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -599,8 +599,9 @@ class AccountMoveLine(models.Model):
 
     @api.v7
     def prepare_move_lines_for_reconciliation_widget(self, cr, uid, line_ids, target_currency_id=False, context=None):
+        recs = self.browse(cr, uid, line_ids, context)
         target_currency = target_currency_id and self.pool.get('res.currency').browse(cr, uid, target_currency_id, context=context) or False
-        return self.browse(cr, uid, line_ids, context).prepare_move_lines_for_reconciliation_widget(target_currency=target_currency)
+        return AccountMoveLine.prepare_move_lines_for_reconciliation_widget(recs, target_currency=target_currency)
 
     @api.v8
     def prepare_move_lines_for_reconciliation_widget(self, target_currency=False, target_date=False):
@@ -695,11 +696,7 @@ class AccountMoveLine(models.Model):
                 accounts = self.pool['account.account'].browse(cr, uid, datum['id'], context=context)
                 self.pool['account.account'].mark_as_reconciled(cr, uid, accounts.ids, context=context)
 
-    @api.v7
-    def process_reconciliation(self, cr, uid, mv_line_ids, new_mv_line_dicts, context=None):
-        return self.browse(cr, uid, mv_line_ids, context).process_reconciliation(new_mv_line_dicts)
-
-    @api.v8
+    @api.multi
     def process_reconciliation(self, new_mv_line_dicts):
         """ Create new move lines from new_mv_line_dicts (if not empty) then call reconcile_partial on self and new move lines
 
diff --git a/addons/account_tax_python/account_tax_python.py b/addons/account_tax_python/account_tax_python.py
index 42a83610f79..57527de81f8 100644
--- a/addons/account_tax_python/account_tax_python.py
+++ b/addons/account_tax_python/account_tax_python.py
@@ -52,7 +52,7 @@ class AccountTaxPython(models.Model):
         partner = partner_id and self.pool.get('res.partner').browse(cr, uid, partner_id, context=context) or None
         ids = isinstance(ids, (int, long)) and [ids] or ids
         recs = self.browse(cr, uid, ids, context=context)
-        return recs.compute_all(price_unit, currency, quantity, product, partner)
+        return AccountTaxPython.compute_all(recs, price_unit, currency, quantity, product, partner)
 
 class AccountTaxTemplatePython(models.Model):
     _inherit = 'account.tax.template'
diff --git a/addons/procurement/procurement.py b/addons/procurement/procurement.py
index ab4fe3c04cc..6c53bd5d545 100644
--- a/addons/procurement/procurement.py
+++ b/addons/procurement/procurement.py
@@ -182,11 +182,6 @@ class procurement_order(osv.osv):
     def reset_to_confirmed(self, cr, uid, ids, context=None):
         return self.write(cr, uid, ids, {'state': 'confirmed'}, context=context)
 
-    @api.v8
-    def run(self, autocommit=False):
-        return self._model.run(self._cr, self._uid, self.ids, autocommit=False, context=self._context)
-
-    @api.v7
     def run(self, cr, uid, ids, autocommit=False, context=None):
         for procurement_id in ids:
             #we intentionnaly do the browse under the for loop to avoid caching all ids which would be resource greedy