class AccountInvoice(models.Model):

    _inherit = 'account.invoice'

    @api.multi
    def action_invoice_open(self):
        invoice_obj_wish=self.env['wishlist.invoice.line']
        invoice_order_id = self.env['sale.order'].search([('name', '=', self.name)], limit=1).id

        for order_details_id in self.browse(invoice_order_id):
           vals ={

                'invoice_status':'open',
                'wishlist_invoice_id': invoice_order_id,
                'wish_inv_number':self.number,
                'invoice_date':self.date_invoice

            }

         
       # invoice_obj_wish.write(vals) @@@@@@@NOT WORKING 
        return super(AccountInvoice,self).action_invoice_open()
class WishlistInvoiceOderLine(models.Model):

    _name='wishlist.invoice.line'

    invoice_id=fields.Many2one('account.invoice','Invoice Reference')
    wishlist_invoice_id = fields.Many2one('sale.order')
    partner_id = fields.Many2one('res.partner', 'Customer')
    invoice_date = fields.Datetime('Invoice Date')
    wishinv_number = fields.Char('Number')
    sales_person_id = fields.Many2one('res.partner', 'Sales Person')
    wish_due_date=fields.Datetime('Due Date')
    wish_source = fields.Char('Source Document')
    commit_date=fields.Datetime('Coomittment Date')
    total=fields.Float('Total')
    wish_amount_due = fields.Float('Amount Due')
    invoice_status=fields.Char('Status')