What allowances apply when a staff member on temporary assignment relocates from one duty station to another? Will they receive certain allowances when they return to their parent duty station?

A temporary movement between duty stations is moving to a different position for a limited period of time within the same Department or Office or in a different Department/Office. The temporary movement between duty stations can be either: a) temporary assignment, where you move to a new position and retain the lien to come back to the same position you left when the assignment ends; or b) temporary loan, where both you and your post are ‘loaned’ to a different organizational unit and supervisor for a definite period of time and at the end both you and your position return to the original organizational unit. Which option selected is a management decision between the two offices. For the staff member, each option has different implications regarding their conditions of service.