Except in the event of failure by any distributor in the Commonwealth to comply with the material requirements imposed upon him by a contract or agreement with the supplier, other than a failure caused by force majeure; or except as may be required by an agency of the federal or state government responsible for regulating allocations of petroleum products; or except as provided in § 59.1-21.18:4, it shall be unlawful for any supplier:
1. To discontinue monthly allocations of petroleum products to a distributor, his successors in interest or qualified assigns provided that such successors in interest or qualified assigns meet the supplier’s usual contract acceptance criteria; or
2. To reduce monthly allocations of petroleum products to a Virginia distributor, his successors in interest or qualified assigns provided that such successors in interest or qualified assigns meet the supplier’s usual contract acceptance criteria.