I need an adjective that, when applied to the word "condition", makes that condition "unbreakable". In the text below the word "necessary" is used. Is there a better adjective in English for such case?

Somehow it has become a rule with time that anyone in our group who is stating a problem that he or she assumes to be taking place in our company must also provide at least one way of solving it. But why? Why should having a ready solution be a necessary condition for stating a problem? Anyone must feel free to bring up a problem even without having any idea how to solve it. In fact, if you already know how to fix a problem, then it doesn't look like a problem to you and you don't really feel the need to state it. However, the very reason why someone would would to state a problem at the meeting is because they don't know the solution while other members may.

I need an adjective that, when applied to the word "condition", makes that condition "unbreakable". In the text below the word "necessary" is used. Is there a better adjective in English for such case?

Somehow it has become a rule with time that anyone in our group who is stating a problem that he or she assumes to be taking place in our company must also provide at least one way of solving it. But why? Why should having a ready solution be a necessary condition for stating a problem? Anyone must feel free to bring up a problem even without having any idea how to solve it. In fact, if you already know how to fix a problem, then it doesn't look like a problem to you and you don't really feel the need to state it. However, the very reason why someone would want to state a problem at the meeting is because they don't know the solution while other members may.