Is it fine to make a poster on a topic in which I have an article under review? Next week I am going on a summer school meeting where the organizers encourage us to bring a poster. I would like to make a poster on a topic that I have covered in an article that is currently under review. Is that fine?

The rules of the conference to which the article is submitted state that I cannot submit any paper that covers the same material to any journal, conference or workshop. Does a poster count as a paper in this context?
Typically this would be okay, because the poster is not published.

If in doubt, contact the PC chair of the conference to make sure.