Section 333.16 - Changes or cancellations of priority ratings and rated orders(a) The priority rating on a rated order may be changed or cancelled by:(1) An official action of FEMA; or(2) Written electronic notification from the person who placed the rated order (including a Delegate Agency).(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 shall constitute 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 § 333.13 .(d) The following amendments do not constitute a new rated order: A change in shipping destination; A reduction in the total amount of the order; an increase in the total amount of the order which has negligible impact upon deliveries; a minor variation in size or design (prior to the start of production); or a change which is agreed upon between the supplier and the customer.(e) A person must cancel any rated orders that the person (or a predecessor in interest) has placed with suppliers or cancel the priority ratings on those orders if the person no longer needs the items in those orders to fill a rated order.(f) A person adding a rating to an unrated order, or changing or cancelling a priority rating must promptly provide written electronic notification to all suppliers to whom the order was sent of the addition, change, or cancellation.