B.4 Break-in-Service If you were not yet vested and worked less than 500 hours under the Plan during a Plan Year before June 30, 2001, you incurred a Break-in-Service at the end of that Plan Year. If not fully vested, you ceased to be a Participant with respect to the unvested portion of your benefit at that time, and forfeited the unvested portion of your Vesting and Benefit Service from any prior year with no right to receive a benefit from the Pension Plan based on service to that date.