The only way we were able to handle this was by using custom code. We have a custom "Bill To Email" field containing the relevant email addresses. Our invoicing process uses that field to determine where to email the invoice to. We also send an Order Confirmation whenever a SO is approved. It uses a different field but…

Hmm... I had not thought of that. I suspect we'll have other issues re-using a Return Authorization for debookings, but let me ask our finance folks