SIEBEL REPOSITORY UPGRADE UTILITY FAILING WITH ERROR: "ORA-30556: either functional or bitmap join i

Hello Siebel Experts,

We are performing the Siebel Upgrade from IP16.8 -> IP22.11 and during Upgrep process we encountered below error :

ORA-30556: either functional or bitmap join index is defined on the column to be modified" FOR S_CL_SUBJ_LS Table

alter table S_CL_SUBJ_LS modify

"SUBJ_INITL"                    varchar2(30 char)

2023-01-19 10:21:20    [1076673536][ODBC 20101 driver][20101]ORA-30556: either functional or bitmap join index is defined on the column to be modified

2023-01-19 10:21:20    60: [1076673536][ODBC 20101 driver][20101]ORA-30556: either functional or bitmap join index is defined on the column to be modified

2023-01-19 10:21:20    alter table S_CL_SUBJ_LS modify;