3723397 - CAP load-balancing RFC : Invalid SYSNR format

• CAP service hitting error:
  
  "msg":"500 - _ [RFCError]: Invalid SYSNR format\n    at r.RFCClientAddonConnectionHandler.throwException (/home/vcap/app/node_modules/@sap-rfc/node-rfc-library/dist/bundle.js:1:2968)\n    at r.RFCClientAddonConnectionHandler.open (/home/vcap/app/node_modules/@sap-rfc/node-rfc-library/dist/bundle.js:1:3355)\n    at async a.createBapiClientConnectionHandler (/home/vcap/app/node_modules/@sap-rfc/node-rfc-library/dist/bundle.js:1:5144)\n    at async RFCService.begin (/home/vcap/app/node_modules/@sap/cds-rfc/lib/rfc.js:101:23)\n    at async RFCService._begin [as dispatch] (/home/vcap/app/node_modules/@sap/cds/lib/srv/srv-tx.js:196:3)\n    at async UserService.<anonymous> (/home/vcap/app/srv/UserService.js:147:28)\n    at async next (/home/vcap/app/node_modules/@sap/cds/lib/srv/srv-dispatch.js:57:17)\n    at async UserService.handle (/home/vcap/app/node_modules/@sap/cds/lib/srv/srv-dispatch.js:55:10) {\n  code: '20',\n  group: 5,\n  key: 'RFC_INVALID_PARAMETER'\n}","type":"log"}
  
  
• And the involved RFC is using load-balancing configuration as mentioned in guide:
  
  https://help.sap.com/docs/connectivity/sap-btp-connectivity-cf/configure-access-control-rfc
  section 8

• CAP with Node.js
• load-balancing RFC

jco.client.ashost, jco.client.sysnr, jco.client.client, jco.client.mshost, Invalid SYSNR format , KBA , BC-XS-CDX-NJS , SAP CAP – node.js runtime , Problem