In OpenERP first, create custom module and than override the function in .py file in custom module  and pass this file to the __init__.py file. Then get the correct line residual amount  and pass this line in account invoice. using this function product_residual and this function residual amount between all invoice.

Using this function given below

def product_residual(self, cr, uid, ids, context=None):
        self.residual = 0.0
        partial_reconciliations_done = []
        for line in self.sudo().move_id.line_id:
            if line.account_id.type not in ('receivable', 'payable'):
                continue
            if line.reconcile_partial_id and line.reconcile_partial_id.id in partial_reconciliations_done:
                continue
            # Get the correct line residual amount
            if line.currency_id == self.currency_id:
                line_amount = line.amount_residual_currency if line.currency_id else line.amount_residual
            else:
                from_currency = line.company_id.currency_id.with_context(date=line.date)
                line_amount = from_currency.compute(line.amount_residual, self.currency_id)
            # For partially reconciled lines, split the residual amount
            if line.reconcile_partial_id:
                partial_reconciliation_invoices = set()
                for pline in line.reconcile_partial_id.line_partial_ids:
                    if pline.invoice and self.type == pline.invoice.type:
                        partial_reconciliation_invoices.update([pline.invoice.id])
                line_amount = self.currency_id.round(line_amount / len(partial_reconciliation_invoices))
                partial_reconciliations_done.append(line.reconcile_partial_id.id)
            self.residual += line_amount
        self.residual = max(self.residual, 0.0)