UNAT considered the Appellant’s appeal and noted that the letters of appointment issued to the Appellant for the period of 1 July 2009 through 30 June 2012 did not refer to either the Memorandum, that described the planned phasing-out of the PTA, or the PTA itself. UNAT also noted that the PTA is neither a benefit or entitlement under the Staff Regulations and Rules, which “embody the conditions of service and the basic rights and duties and obligations of United Nations staff members,” nor an “administrative issuance in application of, and consistent with, the said Regulations and Rules. ”...