(a) The priority rating on a rated order may be changed or canceled by:

(1) An official action of USDA; or

(2) Written notification from the person who placed the rated order.

(b) If an unrated order is amended so as to make it a rated order, or a DO rating is changed to a DX rating, the supplier must give the appropriate preferential treatment to the order as of the date the change is received by the supplier.

(c) An amendment to a rated order that significantly alters a supplier's original production or delivery schedule constitutes a new rated order as of the date of its receipt. The supplier must accept or reject the amended order according to the provisions of § 789.13.

(d) The following amendments do not constitute a new rated order:

(1) A change in shipping destination;

(2) A reduction in the total amount of the order;

(3) An increase in the total amount of the order that has a negligible impact upon deliveries;

(4) A minor variation in size or design; or

(5) A change that is agreed upon between the supplier and the customer.

(e) If a person no longer needs items or services to fill a rated order, any rated orders placed with suppliers for the items or services, or the priority rating on those orders, must be canceled.

(f) When a priority rating is added to an unrated order, or is changed or canceled, all suppliers must be promptly notified in writing.