According to Shari'a rules, it is not permissible for the Mudarib (investment manager), Sharik (partner) or Wakil (agent) to undertake in advance to repurchase the assets at maturity from Sukuk holders or from one who holds them, for their nominal or par value. It is, however, permissible for a third party credit enhancement provider to undertake the purchase on the basis of the net value of assets, their market value, fair value or a price to be agreed at the time of purchase. In such cases, the risks of the assets are retained and are subject to the requirements of section CA-8.4. In the event of negligence or misconduct by the Sukuk manager (i.e. Mudarib, Sharik or Wakil), it is required that the Sukuk manager be liable to guarantee the payment of capital to Sukuk holders, at the nominal or par value (again subject to the requirements of CA-8.4). It is also permissible for a lessee (i.e. the originator) in an Ijara Sukuk to undertake to purchase the leased assets at maturity for their nominal value, provided the lessee is not also a Sharik, Mudarib or Wakil. If the lessee is an Islamic bank licensee, such an undertaking would be treated as a 'clean-up call' (see CA-8.2.21) if it satisfies certain conditions or it is subject to section CA-8.4 if it is of a more general nature.