Solman 7.1 - editing Confirmed tickets in ITSM

Hi gurus,

I need to edit in solman confirmed tickets (in specific Time Recording) - how i can do this? Now it display message "No changes possible in document".

Once, while setting possibility (somewhere in SPRO) to change Message Reporter I saw place, where administrator can set edit possibility depending on its state, but now i cant find it.

Thanks in advance.