Paul, if using a certain message for a ‘generic’ translation, you will always have to fill MSH-9 and EVN-1 yourself. This also applies when using wild card routes.
For instance if you use ADT^A01 as your outbound message, it will automatically fill in A01 in MSH-9.1 and EVN-1 if you don’t do it yourself.
I have created a message simply called ADT, made it very generic and also included the MRG segment. This way I can handle A18 messages as well, with just one translation. Previously I had about 12 or 15 translations from SAP HCM to HL7, which will work also until you need to change one or two things to all these translations. Having only 1 translation is a blessing.
Zuyderland Medisch Centrum; Heerlen/Sittard; The Netherlands
