[ASE Error SQL4939]ALTER TABLE 'saptools..DBH_MSG_LOG' failed

[ASE Error SQL4939]ALTER TABLE 'saptools..DBH_MSG_LOG' failed. You cannot drop column 'SOURCE_HOSTNAME' because it is being used by an index. Drop the index 'DBH_MSG_LOG~1' before dropping this column.

Exception CX_DBA_ADBC in program RAGS_SISE_ACTIVITY_JOB line 0
Kernel Error ID:
WP ID: 13
WP PID: 31439
SYSID: B1D
SY-SUBRC: 0
SQL statement: ALTER TABLE saptools..DBH_MSG_LOG DROP "SOURCE_HOSTNAME" WITH NO DATACOPY
Database: B1D
caused by
Exception CX_SQL_EXCEPTION in class CL_SYB_RDI_QUERY
Kernel Error ID:
DB Error: Yes
SQL Code: 4939
SQL Message: [ASE Error SQL4939]ALTER TABLE 'saptools..DBH_MSG_LOG' failed. You cannot drop column 'SOURCE_HOSTNAME' because it is being used by an index. Drop the index 'DBH_MSG_LOG~1' before dropping this column.

DB Object Exists: No
Duplicated Key: No
Internal Error: 1
Invalid Cursor: No
Unknown Connection: No
Connection Closed: No