Official Order Rejection via EDI

Question: Currently we receive 830's from customers and the scheduling agreements are automatically updated. We would like to be able to send official order rejections via EDI. What message type would I use for this?
Has anyone done this in the past?

Thanks for your help!

Answer:
What I've done (But I'm not sure it fits your needs):
an ABAP program runs once a day a searchs for rejected ORDERS (status with error). From the rejected IDOC, it creates a ORDRSP IDOC with the necessary control and business data (including the error code).
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Remi
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