Missing Edit button Service Desk

Hello experts,

We are doing the upgrade of our solution manager 7.0 to 7.1 SP10 and we have arrived at the incident management part:

But as you can guess, we encounter a problem. Hopefully someone could help us out:

We are using CRM UI for both message creators and message processors. But when a processor puts the status of the incident on "proposed solution", then the creator cannot confirm it. It seems that the "edit" button is missing. In our sandbox enviroment the button is there (but sandbox = 7.1SP08). note: the creator has a SAP_ALL.

Thanks very much