Under the current scheme of the PSEA, priority appointments are not subject to recourse to the public service staffing tribunal. My understanding is that this is a consequential amendment to section 87 of the PSEA in order to ensure that the appointments of persons with the medical release from the CAF, the new priority, would not be subject to recourse of the public service staffing tribunal as well. So, It's just a matter of ensuring that this new priority entitlement is treated exactly the same as all the existing priority entitlements.
On October 29th, 2014. See this statement in context.