3409978 - SETUSER often encounters an error 'Permission denied' - SAP IQ

User having SYS_AUTH_DBA_ROLE often unables to impersonate(by SETUSER) another user. Sometimes it encounters below Permission error,

  1> setuser test_user
  2> go

    Msg 262, Level 16, State 0:
    SQL Anywhere Error -121: Permission denied: you do not have permission to set user "test_user"

SAP IQ 16.1 SP05.X

SETUSER , impersonate, set_usercheck , CR828437, 828437, , KBA , BC-SYB-IQ , Sybase IQ , Problem