If not what John suggested, it could also be that you are not in a user role that has the Transition Issues permission.
Yes, forgot to add that one - thanks! Check the Permission Scheme for Transition Issues permission. Thanks, Dharma!
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My roles on this projects are: Administrator, Project Lead, Scrum Master, Developer and user (see file attached). So this seems ok.
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And the workflow seems to be ok, too (see picture attached).
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Probably I found the problem (see the picture "Transition". It seems that I don't have a permission to transition items in the workflow. If so how can I have this permission? Can I do it by myself or do I have to ask to Jira administrator?
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Yes, that is what Dharma and I were referring to up above. Yes, you have to be an administrator to change those settings.
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From within the issue, take a look at the workflow to see if it is setup properly. Then you will need to check any conditions on the transition from To Do to In Progress.
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