Ah, thanks, that explains it.
I'm afraid you need code. If you have the Script Runner add-on, you can put validators into the workflow to force entry (my notes say the single line cfValues['your cascading field']?.values()*.value.size() == 2 will do it, but I did make those notes when working with JIRA 5). You might also be able to do it with the Behaviours function.
If you don't have Script Runner, you'll need to find or write another add-on to be able to provide a validator
Apologies, I missed the response.
I don't use Behaviours enough to answer that directly. In general, I can tell you that you should create a new Behaviour, which you can tie to a field, and then put conditions on it like "is mandatory when it matches this rule". You may be able to use the code I gave for doing it in a validator.
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