Add support for EDIFACT ORDCHG message

[Galen Charlton]

EDItEUR's library book supply EDIFACT application profile [1] includes the ORDCHG message to request changes to an order, including cancelling line items. It _might_ be useful to add support for it. A potential workflow might be:

- Library creates PO and sends it to provider via EDI.
- Selector things better of a title and sets a cancelled-by-library status on the line item.
- Evergreen sends an ORDCHG message to the provider.

Another potential workflow:

- Library sends an ORDERS message prematurely
- Library deactivates the PO, and Evergreen sends an ORDCHG to cancel the whole thing

Or another:

- Library changes the desired quantity for a line item. Evergreen sends an ORDCHG to request it.

At least one Ex Libris product has support for the ORDCHG message [2]. However, off the top of my head I don't know which providers themselves support ORDCHG. There of course would also be workflow consequences, if for no other reason to account for the fact that providers presumably do not offer libraries unlimited time to make changes to a given order.

[1] https://www.editeur.org/31/Library-Book-Supply/
[2] https://developers.exlibrisgroup.com/alma/integrations/edi/cancel/

[Galen Charlton (gmc)]

And to be clear, this wishlist is entirely hypothetical at present, as I could imagine that the online order management tools that the providers offer nowadays may make any need for ORDCHG support mostly moot.

[Tiffany Little (tslittle)]

Fwiw, I actually think this would be super useful. When I'm doing Acq training now, I always have to be clear that the order submission and order response are the only two times Acq "talks" to the vendor--we only get the one bite at the apple. Also that cancellation in Acq does *not* mean cancellation with the vendor. This would clear some of that confusion, and also streamline workflows since you wouldn't need to cancel both in Acq and on the vendor websites.

[Galen Charlton (gmc)]

Thanks, Tiffany! Do you know of any providers who can accept ORDCHG messages?

[Tiffany Little (tslittle)]

I sent emails to Brodart, B&T and Ingram this morning so I'll update the bug when I hear back.

[Tiffany Little (tslittle)]

Update: I got response from all three of the aforementioned vendors. As of today, Brodart and B&T do not support these type of messages. Ingram supports these messages in an X12 format, but not currently in EDIFACT.