The situation was that under the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), the class of investments that can be screened under overseas investment regimes closed from the date of inception of that agreement. So unless there was a screening regime for a class of assets in place by that date, the Government of New Zealand could not thereafter introduce it unless they withdrew from CPTPP and other agreements that relied upon the most favoured nation clause relating to investment protocols, which sucked the CPTPP restriction on new classes of screening into earlier agreements, including the China free-trade agreement.