In a construction related transaction, provided the construction work proceeds normally and to the ultimate customer's satisfaction, the risk attaching to the progress payments due from the ultimate customer to the Mudarib will be the credit risk of the ultimate customer. However, this does not per se constitute a mitigation of the credit risk of the Islamic bank licensee's exposure to the Mudarib. In such a case, if an independent engineer employed to certify that the work has reached a certain stage of completion has issued a certificate to that effect, so that a progress payment is due from the ultimate customer, from the point of view of the Islamic bank licensee the amount of that progress payment due is no longer exposed to the risk of unsatisfactory performance by the Mudarib, but only to the latter's failure to pay the Islamic bank licensee (the Mudarib being exposed to possible default by the ultimate customer). Such an amount might thus arguably bear a RW based entirely on the credit standing of the Mudarib — that is, say 100%, rather than 400%. However, if a binding agreement exists between the Islamic bank licensee and the ultimate customer whereby the latter will make the payment into a "repayment account" with the Islamic bank licensee, the latter's credit exposure in respect of the amount due is transferred from the Mudarib to the ultimate customer.