Cannot Change Campaign Status from Launched to Completed

Hi

I have defined a state model for Status field of Campaign BC. I've defined all the regions and trainsitions workfing well but changing from Launched to Completed. If I disable the state model the transition can be made without problems, With the state model I don't see any error but when I move off the Status goes back to Launched.

When I see the log it says that the user doesn't have enough privileges.

Anyone knows what culd be the problem?

Thanks in advance

Gabriel