Hi all,
Here is my solution. it works to me.
1. create TMSADM_WF (user tpye: system) manually in workflow system and use your own password.
2. create proposal workflow system in STMS workflow engine tab
3. change TMSADM_WF password in RFC TMSWF@WORKFLOW_ENGINE
(note 2017125: put TOGL in tcode filed at SM59 page of TMSWF@WORKFLOW_ENGINE)
Stanley