Hi Mahabaleshwara,
Siteminder will set the UserID/UserPath based on the field which is used for disambiguation.
For ex: here we passed "jhunter" as user ID and siteminder is able to disambiguate and set the user path as userID.
Fri Nov 24 17:24:58.662 2017 INFO: pid 4160 tid 6040: 0 Start ShimController::authenticate
Fri Nov 24 17:24:58.662 2017 INFO: pid 4160 tid 6040: 0 Password field is JSON. Get TokenId...
Fri Nov 24 17:24:58.662 2017 INFO: pid 4160 tid 6040: 0 Start ShimController::processPreRiskOnePage
Fri Nov 24 17:24:58.662 2017 INFO: pid 4160 tid 6040: 0 Disambiguating user : jhunter
Fri Nov 24 17:24:58.662 2017 LOW: pid 4160 tid 6040: 0 Start ShimController::disambiguate
Fri Nov 24 17:24:58.662 2017 LOW: pid 4160 tid 6040: 0 Allow SiteMinder to do user-disambiguation
Fri Nov 24 17:24:58.662 2017 LOW: pid 4160 tid 6040: 0 End ShimController::disambiguate
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 Start ShimController::createToken
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 Creating token with attributes...
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 LoginId = jhunter
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 UserId = uid=jhunter, ou=People, dc=example,dc=com
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 AuthStatus = Authenticated
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 ShimReturnFCCURL = http://sharanI169966.ca.com:80/arcotlogin/shimfinal.fcc
Fri Nov 24 17:24:58.669 2017 LOW: pid 4160 tid 6040: 0 LogMsgFromShim = Authentication successful
I dont think we can set to same value irrespective of disambiguation ID with the OOTB.
[11/24/2017][17:24:58.751][17:24:58][4160][6040][Sm_Auth_Message.cpp:5178][CSm_Auth_Message::FormatAttribute][s5/r7][sanre01-I169966_webagent][][jhunter][][PostAuthRisk_realm][Arcot_with_Risk][Oracle_UD][][][][][][][][][][][][....][Send response attribute 212, data size is 4][][][Arcot_auth_postauth][][][00 00 00 1b ][][][][][uid=jhunter, ou=People, dc=example,dc=com][06-38af90db-b044-4d4f-bf62-57800d80dda3][][Login][][][][][][][][][][][][][][][][][][][][]
[11/24/2017][17:24:58.751][17:24:58][4160][6040][Sm_Auth_Message.cpp:5178][CSm_Auth_Message::FormatAttribute][s5/r7][sanre01-I169966_webagent][][jhunter][][PostAuthRisk_realm][Arcot_with_Risk][Oracle_UD][][][][][][][][][][][][http://sharan-i3859.ca.com:8080/arcotafm/master.jsp?profile=postauthrisk&tokenID=a475e7f67d9d22d5fb2eb985e031cc1578f233cc][Send response attribute 227, data size is 122][][][Arcot_auth_postauth][][][68 74 74 70 3a 2f 2f 6b 61 72 73 68 30 37 2d 69 33 38 35 39 2e 63 61 2e 63 6f 6d 3a 38 30 38 30 2f 61 72 63 6f 74 61 66 6d 2f 6d 61 73 74 65 72 2e 6a 73 70 3f 70 72 6f 66 69 6c 65 3d 70 6f 73 74 61 75 74 68 72 69 73 6b 26 74 6f 6b 65 6e 49 44 3d 61 34 37 35 65 37 66 36 37 64 39 64 32 32 64 35 66 62 32 65 62 39 38 35 65 30 33 31 63 63 31 35 37 38 66 32 33 33 63 63 ][][][][][uid=jhunter, ou=People, dc=example,dc=com][06-38af90db-b044-4d4f-bf62-57800d80dda3][][Login][][][][][][][][][][][][][][][][][][][][]
[11/24/2017][17:24:58.751][17:24:58][4160][6040][Sm_Auth_Message.cpp:4675][CSm_Auth_Message::SendReply][s5/r7][sanre01-i169966_webagent][][jhunter][][PostAuthRisk_realm][Arcot_with_Risk][Oracle_UD][][][][][][][][][][][][][** Status: Authentication Challenged. ][][][Arcot_auth_postauth][][][][][][][][uid=jhunter, ou=People, dc=example,dc=com][06-38af90db-b044-4d4f-bf62-57800d80dda3][][][][][][][][][][][][][][][][][][][][][][]
[11/24/2017][17:24:58.751][17:24:58][4160][6040][Sm_Auth_Message.cpp:4679][CSm_Auth_Message::SendReply][][][][][][][][][][][][][][][][][][][][][Leave function CSm_Auth_Message::SendReply][][][][][][][][00:00:00.001000][][][][][][][][][][][][][][][][][][][][][][][][][][]
Thanks,
Sharan