Our working arrangement with the employer provides for self-assignment in the organization of work. Art. 18 deals with question in many of its clauses. Remember the principle enunciated in 18.1 “…employees are responsible for…organizing their work…and to manage their work schedule…” Your supervisor cannot therefore decide by himself on your behalf. We have negotiated a very flexible averaging system in return for the right to professional autonomy. A case like yours should be flagged immediately to your local APS representative. APS has the right to file grievances directly at the national level (art.19.4.4) and a case like this warrants such action.