edit_move_line/model/account_invoice_move_line.py

# -*- coding: utf-8 -*-

from openerp import models, fields, api
from openerp.osv import osv

class invoice_interes(models.Model):
    _inherit = "account.invoice"
    _name = "account.invoice"

    move_line_debt = fields.One2many('account.move.line', inverse_name="invoice", string="id Move line", domain=['&', ('reconcile_id', '=', False), '&', ('account_id.active','=', True), '&', ('account_id.type', '=', 'receivable'), ('state', '!=', 'draft')])
    state_move_line= fields.Boolean(readonly=True, default=False)



    @api.multi
    def update_ammount_move(self):
        # Variables
        total_voucher=0
        monto_residual=0
        cuota_dividida=0
        estado =None
        cambio_py=0

        if len(self.payment_ids) < 1:
            raise osv.except_osv('Advertencia','No es posible continuar con la operación, para generar la división del saldo es necesario que pague su primera entrega')
            return
        #Verifica si  existe mas de una linea en move live
        if len(self.move_line_debt) > 1:
            # Actulizar estado del journal cuando tipo es venta
            datos_journal = self.env['account.journal'].search([('type', '=', 'sale')])
            datos_journal.write({'entry_posted' : True})

            # rate_model = self.env['res.currency.rate'].search([('currency_id', '=', 166)])
            # rate_py = rate_model[len(rate_model)-1]
            # cambio_py =rate_py.rate

            if self.currency_id.id == 3:
                monto_residual = self.residual
            else:
                monto_residual = self.residual/self.currency_id.rate_ids.rate

            # Calular la divicion la cuota
            cuota_dividida = (monto_residual / len(self.move_line_debt))
            print(monto_residual)
            print(cuota_dividida)
            for move_line in self.move_line_debt:
                move_dato = self.env['account.move'].search([('id', 'in', move_line.move_id.ids)])
                if move_dato:
                    estado = move_dato.state
                move_dato.write({'state' : 'draft'})

                line_voucher = self.env['account.voucher.line'].search([('move_line_id', '=', move_line.id), ('amount', '>', 0)],order='id')
                print(line_voucher)
                if line_voucher:
                    for voucher in line_voucher:

                        if voucher.voucher_id.payment_rate_currency_id.id == 3:
                            print("moneda Dolar ")
                            total_voucher += voucher.amount
                        else:
                            print("ota moneda")
                            print("Cambio "+str(voucher.voucher_id.payment_rate_currency_id))
                            total_voucher +=(voucher.amount / voucher.voucher_id.payment_rate_currency_id.rate_ids.rate)

                print("cuota "+str(cuota_dividida))
                print("pagado " +str(total_voucher))
                print('total '+str(cuota_dividida + total_voucher))
                move_line_dato = self.env['account.move.line'].search([('id', '=', move_line.id)])
                move_line_dato.write({'debit' : (cuota_dividida + total_voucher)})

                # move_line_dato.write({'amount_currency' : ((move_line_dato.debit - move_line_dato.credit)*cambio_py)})

                if  estado == None:
                    estado='draft'
                move_dato.write({'state' : estado})

                # move_line_dato._amount_residual(move_line_dato.amount_residual_currency)

            datos_journal.write({'entry_posted' : False})
            incoice_datos = self.env['account.invoice'].search([('id', '=',self.id )])
            incoice_datos.write({'state_move_line' : True})

            move_line_state = self.env['account.move.line'].search([('ref', '=', self.number)])
            move_line_state.write({'state' : 'valid'})

        else:
            raise osv.except_osv('Advertencia','No es posible generar la división  del saldo sobre una única linea')
            return