Steps :
1. Craete ECC connection by providing server name , client details etc. for ECC system you intend to use under Data service->connection if not created already.
2. Either create a credentail store to use in Jco/Jra or pass directly sap username/password in the action block.
3.Use SAP Jco or JRA block in BLS .
4. Call RFC_READ_TABLE using SAP JCO function block and get the output and pass it to anther SAP JCO function block used for calling BAPI_INSPOINT_GETLIST and get the final output.