This operation is unreasonable. Whoever reimburses the expenses will sign the reimburser, and the expenses are useless. Why do you sign someone else's reimbursement, so it becomes your reimbursement? This will bring you a lot of trouble in the future. If you are a cashier, just sign your name at the cashier's position, and you must go to your leader to sign and agree to spend every expense. You must abide by this principle so that you won't get into trouble in the future. If the leader insists that you do this, then don't take this job and don't make trouble for yourself in order to get a job.