Hi Dimitri,
This incident is in customer action for more than a month. This incident is being processed by primary support colleagues and I just checked the payload attached is that of an ORDERS and INSDES. It is not possible that a EDI Sender channel picks up ORDERS message and gives a GENRAL error. If you see the screenshot closely then in the configuration string it clearly says that it is GENRAL configuration.
prem desai As far as fallback to EDIFACT is concerned then last week there was a patch released by one of my colleagues. I don't remember the note number but you can upgrade to the latest patch of your current SP pack.