Adding validator for custom field issue transition

[Aaron Larson]

I created a custom field that poses a question, with the "Radio Buttons" providing only two available answers, "Yes", and "No".

How can I add a validator to an issue transition which would only let the issue transition if the response was "Yes"?

Alternatively, is there a better way to do this?  

I tried using regular JQL to define the validator, but it couldn't understand it because it wasn't S-JQL and I'm not that advanced.

Thank you,

[Nic Brough -Adaptavist-]

I'm not sure what S-JQL means.  Also, how are you doing this JQL in a validator?  What add-on are you using?

My instinct would be to do it slightly differently - use a condition that says "only if field = yes", but a validator would work on the same basis.

[Aaron Larson]

The validator is called "Issue Matches Structure Query", and the S in S-JGL is for Structure.  If used correctly, the issue would need to match the query in order to pass the transition, but my "normal" JQL isn't understood by it.

I would love to use that condition too, but I don't see the option to use one with "only if field = ...".  Is it possible to create custom conditions?