86 mission who as part of their official functions participate in activities organized by a Government, intergovernmental organization, non-governmental organization or other private source may receive from it accommodation and travel and subsistence allowance generally in line with those payable by the United Nations, and in such cases the allowances that may otherwise be payable by the United Nations shall be reduced in the same amount as in respect of staff members of the Organization. Such provisions are presently found in staff rule 107.15 (a). 2. It should be noted that accommodation and travel and subsistence allowance may be accepted only if their acceptance would be appropriate to the status of officials and experts on mission and to the integrity, independence and impartiality that are required by that status. There may therefore be situations in which it would not be appropriate to accept those allowances from a Government, intergovernmental organization, non-governmental organization or other private source. Regulation 3 – Accountability Officials and experts on mission are accountable to the United Nations for the proper discharge of their functions. Commentary Regulation 3, which is similar to staff regulation 1.3 (a), makes clear that officials and experts on mission are accountable for their actions. The method of accountability may vary. For officials appointed by the General Assembly, that accountability would be a matter for the Assembly. For experts on mission, it would be the Secretary-General or the appointing authority who could terminate an assignment or otherwise admonish the expert.