old_contents: # -*- coding: utf-8 -*-
  ##############################################################################
  #
  #    Author: Vincent Renaville
  #    Copyright 2014 Camptocamp SA
  #
  #    This program is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Affero General Public License as
  #    published by the Free Software Foundation, either version 3 of the
  #    License, or (at your option) any later version.
  #
  #    This program is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Affero General Public License for more details.
  #
  #    You should have received a copy of the GNU Affero General Public License
  #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  #
  ##############################################################################
  from openerp.osv import orm
  
  
  class payment_order_create(orm.TransientModel):
  
      _inherit = 'payment.order.create'
  
      def create_payment(self, cr, uid, ids, context=None):
          """
          We add is_multi_currency tag to be able set
          'amount_currency': line.amount_residual_currency
          instead of
          'amount_currency': line.amount_to_pay
          To be compliant with multi currency
          Allready corrected in V8 but will not be corrected in V7
          """
          context.update({'is_multi_currency': True})
          return super(payment_order_create, self).create_payment(
              cr,
              uid,
              ids,
              context=context)
  
  
  class payment_line(orm.Model):
      _inherit = 'payment.line'
  
      def create(self, cr, uid, vals, context=None):
          """In case of multi currency
          we use amount_residual_currency instead of amount_to_pay"""
          if context.get('is_multi_currency'):
              account_move_line_obj = self.pool['account.move.line']
              move_line = account_move_line_obj.browse(
                  cr,
                  uid,
                  vals['move_line_id'],
                  context=context)
              vals['amount_currency'] = move_line.amount_residual_currency
          return super(payment_line, self).create(cr, uid, vals, context=context)
  
new_contents: # -*- coding: utf-8 -*-
  ##############################################################################
  #
  #    Author: Vincent Renaville
  #    Copyright 2014 Camptocamp SA
  #
  #    This program is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Affero General Public License as
  #    published by the Free Software Foundation, either version 3 of the
  #    License, or (at your option) any later version.
  #
  #    This program is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Affero General Public License for more details.
  #
  #    You should have received a copy of the GNU Affero General Public License
  #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  #
  ##############################################################################
  from openerp.osv import orm
  
  
  class payment_order_create(orm.TransientModel):
  
      _inherit = 'payment.order.create'
  
      def create_payment(self, cr, uid, ids, context=None):
          """
          We add is_multi_currency tag to be able set
          'amount_currency': line.amount_residual_currency
          instead of
          'amount_currency': line.amount_to_pay
          To be compliant with multi currency
          Allready corrected in V8 but will not be corrected in V7
          """
          if context is None:
              context = {}
          context.update({'is_multi_currency': True})
          return super(payment_order_create, self).create_payment(
              cr,
              uid,
              ids,
              context=context)
  
  
  class payment_line(orm.Model):
      _inherit = 'payment.line'
  
      def create(self, cr, uid, vals, context=None):
          """In case of multi currency
          we use amount_residual_currency instead of amount_to_pay"""
          if context is None:
              context = {}
          if context.get('is_multi_currency'):
              account_move_line_obj = self.pool['account.move.line']
              move_line = account_move_line_obj.browse(
                  cr,
                  uid,
                  vals['move_line_id'],
                  context=context)
              vals['amount_currency'] = move_line.amount_residual_currency
          return super(payment_line, self).create(cr, uid, vals, context=context)
  
subject: add context safe guard