Sorry, I wasn’t very clear on that. I needed to return x12 EDI with the same delimiters as I was receiving, and as reamon pointed out, the delimiter fields in the TPA are for the outgoing.
In the end, I traced the invoked services when the doc first arrives, and in a “values” section found that the delimiter they are using was /r.
Thanks
#B2B-Integration#Integration-Server-and-ESB#webMethods