Never heard of it but seems like a customisation of the X12
invoice. Not sure what they mean by that question, it's very broad. They
could be just after simple EDI translation or a fully fledged EDI
solution with validation, partner management, transaction management,
reporting, etc...
Out-of-the-box, Smooks
can naively translate WAWF 810 thanks to the EDI cartridge but usually
this is only a small part of what organisations need when processing
EDI. Open-source can always be used with EDI but it really depends on
how much effort the implementer is willing to put in :) There is
https://github.com/mescedia/mescedia-core which I think aims to be an
end-to-end open-source solution for EDI but I can't comment on its
status.
Claude