Any Council decision by which the Council decides to establish or extend a Union military operation shall contain a reference amount for the common costs of that operation. The administrator shall, with the support in particular of the Union military staff and, if he or she is in office, the operation commander, evaluate the amount judged necessary to cover the common costs of the operation for the planned period. The administrator shall propose this amount through the Presidency to the Council body responsible for examining the draft decision. The members of the Special Committee shall be invited to the discussions of this body concerning the reference amount.