Hi,
You need to have SLD inplace. (System Landscape Directory - Solution Manager)
Than the business System can be found. If you have no Solman access you can also fake an entry in table: LCRT_CLNTCACHE. ;-) Check TX: SLDCHECK
But when you are on S4Hana you don't need the WS-RM Connection.
It will work (tested it), but it's not necessary.
Check Note: 2196823.
kr Christian