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UNAT considered an appeal by the Secretary-General. UNAT held that Ms. Caucci’s situation differed from the UNDT Judgment in Tran Nguyen (UNDT/2015/002) and therefore it was erroneous for the UNDT to apply such jurisprudence to find that Ms. Caucci had a general service lien with MINUSMA during and after her service with DPO. UNAT held that the rights of staff members on secondment under the Inter-Organization Agreement concerning Transfer, Secondment or Loan of Staff among the Organizations applying the United Nations Common System of Salaries and Allowance, which was at issue in Tran Nguyen, was not applicable to Ms. Caucci who was not on secondment and only held a fixed-term appointment (not a permanent appointment). UNAT held that all Ms. Caucci had was the specific lien on her former post with MINUSMA which was extended until 30 April 2019. UNAT held that, in entering into the Memorandum of Understanding (MoU) on 20 April 2019, Ms. Caucci gave up the specific lien to this or any other MINUSMA post. UNAT held that such MoUs are common and have been deemed lawful and binding by UNAT. UNAT held that as the content and meaning of the MoU was plain and clear, and there was no allegation of duress, there was no reason why the MoU should not have been enforced. UNAT held that it followed from the MoU that Ms. Caucci was estopped from taking legal action against any administrative decision related to its implementation. UNAT held that the subsequent separation decision implemented the MoU. UNAT granted the Secretary-General’s appeal, reversed the UNDT Judgment and dismissed Ms. Caucci’s application.