At the time that overtime assignments are made known to the responsible steward or during the course of working the overtime, if errors in the application of the overtime rotating list become known to the steward, he or she shall advise the supervision of any assignment errors so corrections may be made prior to or during the performance of work. Once advised that there is a mistake, supervision still has the prerogative to make the assignments. The responsible steward may then file under the grievance procedure. Employees not called for or offered the overtime when entitled shall be made whole for their loss. If overtime assignments are not made known to the responsible steward and a mistake is made, any affected employee shall be made whole for his loss. Under no circumstances will a steward's action regarding the above negate management's responsibility to make an employee whole for his loss.