During the daytime I'm active in SAP, and in the evening hours I'm enjoying Node-red.... SAP offers lots of communication technologies (idocs, webservices, Rfc, ...). Is there already setup in SAP that you want to call from Node-red?
E.g. when you have an RFC enabled function module, you can connect to it by using the RFC.dll. But perhaps all SAP communication in your company has to go via a PO system....
Greetings,
Bart