Hello,

I am trying to upgrade 'contract_customer_invoice' module that adds new field relations in analytic account (contract) from version 7 to version 8. Lines of code that result in error (NotImplementedError: 'update' not supported on frozendict) are in bold.

class one2many_mod(fields.one2many):
    def get(self, cr, obj, ids, name, user=None,
            offset=0, context=None, values=None):
        if context is None:
            context = {}
        if self._context:
            context = context.copy()
            context.update(self._context)
            context.update({
           'default_active': False,
           'active_test': False,
           })
        return super(one2many_mod, self.with_context(default_active=False,active_test=False)).\
            get(cr, obj, ids, name, user=user,
                    offset=offset, context=context, values=values)

class account_analytic_account(orm.Model):
    _inherit = 'account.analytic.account'
    _columns = {
        'active': fields.boolean('Active'),
        'client_num': fields.char('Client Number', size=64),
        'period_ids': fields.one2many('period.contract', 'contract_id',
                                      'Periods'),
        'invoice_ids': fields.one2many('account.invoice', 'contract_id',
                                       'Invoices', readonly=True),
        'product_ids': one2many_mod('product.product', 'contract_id',
                                    'Products'),
        'sap_number': fields.char('SAP Number', size=64),
        'payment_term_id': fields.many2one('account.payment.term', 'Payment Term'),
    }

 Any ideas how to resolve it?