Due diligence certificate requirement: lead managers must submit prescribed certificates before filing a fast track offer document. Issuers of fast track further public offers must file the offer document with the Board and stock exchanges and pay applicable filing fees; lead managers must submit a due diligence certificate with specified additional confirmations, and for fast track issues of convertible debt instruments a debenture trustee due diligence certificate; the 'reference date' is the date of filing the red herring prospectus or prospectus with the Registrar of Companies.