Hi Hayashi,
If you have already set up a ROS running, you could simply maintain an external web service for ROS supplier directory with the customizing mentioned in KBA 2041611.
Maybe you could try using the following data as a reference in your system.
When you define the web service for ros directory, pay attention to the two fields below.
Bus.Type of a WebService: Supplier Directory
Vendor Root Node: <enter your vendor root node>
Standard Call Structure:
0 http://<domain of your ros system>:port URL
10 /sap/bc/bsp/sap/ros_prescreen/main.do URL
20 sap-client <ROS client>
30 sap-user <RFC user to ROS> Fixed Value
40 sap-password <password> Fixed Value
50 sap-sessioncmd open Fixed Value
60 sap-language sy-langu SAP Field
70 OkCode * Fixed Value
80 Target _top Fixed Value
90 Caller CTLG Fixed Value
100 HOOK_URLeturn URL
Hope this could help you.
Regards,
Wendy