Common use of Challenge to registration Clause in Contracts

Challenge to registration. The registration of a Delivered Vessel or the Mortgage or the Collateral Mortgage is contested or becomes void or voidable or liable to cancellation or termination, or the validity or priority of the Mortgage or the Collateral Mortgage is contested. This Clause 23.1.18 shall not apply to any release of the Collateral Mortgage permitted by Clause 17.15 (Release of Collateral Security Documents).