2191190 - Could not create user TMSADM_WF error configuring workflow

The following error is raised activating TMS workflow:

Could not create user TMSADM_WF
Message no. XT006

Diagnosis
User TMSADM_WF is created when the Transport Management System is
configured. This is done using function module SUSR_RFC_USER_INTERFACE.
An error occurred here:

   User: TMSADM_WF
   Action:
   Exception: 6

Meaning of the action:
   01   Create
   02   Change
   03   Read
   04   Check

Meaning of the exception:
    1   user_dont_exist
    2   user_already_exists
    3   not_authorized
    4   username_required
    5   bad_method
    6   password_required
    7   usergroup_dont_exist
    8   bad_time_rage
    9   bad_usertype
   10   update_error
   99   others

The exceptions are explained in the documentation for function
module SUSR_RFC_USER_INTERFACE.

TMSADM_WF TMS workflow configuration setup password profile XT006 SUSR_RFC_USER_INTERFACE STMS SU01 S_A.TMSADM S_A.TMSWF SWU3 , KBA , BC-CTS-TMS , Transport Management System , BC-BMT-WFM , Business Workflow , Problem