If the exposure under the diminishing Musharakah contract consists of working capital finance in the customer's business venture, the Islamic bank licensee must measure its credit risk similarly to an equity exposure held in the banking book, as set out in Paragraphs CA-4.8.4 to CA-4.8.11 (Commercial enterprise to undertake a business venture). This treatment is, however, subject to the consideration of any third-party guarantee to make good impairment losses. In that case, the RW of the guarantor is substituted for that of the outstanding balance of the Musharakah investment for the amount of any such guarantee. Moreover, subject to obtaining prior approval from the CBB, an Islamic bank licensee can use the supervisory slotting method, based on the criteria set out in Appendix CA-6 (diminishing Musharakah).