Gentlemen：
The shipment we received on the above referenced purchase order was incomplete. The following parts were missing：
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________________________________
We would appreciate it if you would rush the missing parts to us immediately. If you are unable to do so， please call me at [telephone] upon receipt of this letter.
Thank you for your prompt attention to this matter.
The shipment we received on the above referenced purchase order was incomplete. The following parts were missing：
________________________________
________________________________
We would appreciate it if you would rush the missing parts to us immediately. If you are unable to do so， please call me at [telephone] upon receipt of this letter.
Thank you for your prompt attention to this matter.