Irrevocable payment commitments permitted for custodians to settle FII share purchases, subject to bank exposure and compliance norms. Custodian banks may issue Irrevocable Payment Commitments (IPCs) to stock exchanges/clearing corporations on behalf of FIIs for purchase of shares under the Portfolio Investment Scheme, subject to Reserve Bank regulations on banks' exposure to the capital market and existing DBOD instructions; amendments to the Guarantee Regulations will follow and AD Category I banks must inform constituents and ensure regulatory compliance.