Hi Joyca:
Many thanks for your reply.
"We correctly got CSOL lock. We release it" Did you manually go and delete the entry from /TMWFLOW/LOCKMON? We never do that over here. Well, kind of, but generally speaking they are taken care of when the transports and projects are moved to Production.
What about /TMWFLOW/CONFIG_LOCK? Do you have downgrade protection enabled? If yes, have you acknowledge or ignore the warnings in the DGP assignment block in the respective or affected change documents? Could you attach a screenshot of your /TMWFLOW/CONFIG_LOCK to see how are the locks setup.
Sorry Joyca, I wish I was one of the experts to give you a solution with one click. You have to live with that until somebody else jumps in. Hopefully we can resolve it before that happens. 
Regards,
Juan
PS. What I am trying is to get more details to try to figure out where the lock is happening.