An Allen ISD Purchase Order must be required by vendor before order fulfillment takes place.Inspection of delivery will be made at the delivery point unless otherwise specified.Materials must be properly packaged and marked with the purchase order number.No change(s) shall be made to this order without written authorization of the purchasing department.No charge will be allowed for packing, crating, palletizing or boxing. No substitution will be accepted without purchasing department approval. Unsatisfactory materials will be returned at seller’s expense. All materials and services shall be subject to the District’s approval. Allen ISD reserves the right to cancel all or any part of this order if not shipped as required or as instructed.