Convertible debt instruments prohibited for promoter group financing, except fully convertible issues with a short conversion period. Issuance of convertible debt instruments is prohibited when used to finance, provide loans to, or acquire shares of members of the issuer's promoter group or group companies. An exception allows issuance of fully convertible instruments for those purposes only if they convert into equity within a short conversion period from the date of issue, making conversion timing the dispositive eligibility condition for the exception.