Hi Mike,
The reasoning for having the Send Method apply to all document types rather than just POs was that the release of PO8.1C did not allow vendor selection when printing documents with multiple vendors, and thus the desire was to avoid printing/sending documents that shouldn't (such as shipping charges). Vendor selection when printing will available in the next upgrade of PO, though the send method will still apply to all document types, at least in the very next release (which should be soon).
Purchase Orders is different than Order Entry for printing, primarily because PO documents can have multiple vendors, and OE documents can only have one customer. But I will pass your suggestion to Development, for one-off printing to always send POs by the chosen method (for selected vendors) even if the vendor is not set up to send POs that way.
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Regards,
Softrak Tech Support