Hi Sapman,
I'm afraid this function is not provided in the R/3-standard, as stated in the note 407600:
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Note that in general, it isnot possible to send a message to another address than to those of the supplying plant - also not then if in the stock transport order a message type for a partner (for example, ordering address) was determined.
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As supplementary information, refer to Notes 117537 (ME27: No partner determination in the case of stock transport orders) and 132657 (ME27: No messages to other partners possible).
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Hope this could be helpful.
Best regards,
Yang