since the volume has not been that much lately my hours have been cut. i have to switch up with another employee on small sort. i was wondering since i do have some seniorty then the newest hire but my supervisor tells me that he is the designated responder so he has to come in even though i have more seniority. another employee told me that are not allowed to do that and i should talk to the shop steward. i just wanted to come here and see if they are right.