This should work for < and > as well. Can you provide an example of your problem as LSS file (copy your survey, delete everything that is irrelevant to the problem and export it as LSS).

wrote:

This should work for < and > as well. Can you provide an example of your problem as LSS file (copy your survey, delete everything that is irrelevant to the problem and export it as LSS).

Sadly it doesn't work in my case.
I was doing some tests, and it turns out that the equation identifies the "written" form of these operators. I mean:
"gt" for ">"
"ge" for ">="
"lt" for "<",
and "le" for "<=".

Don't ask me how I came to try these alternatives

Well, the "<", ">" ,and so on are accepted, but you have to take care that the editor doesn't identifies them as the start or end of an HTML tag.
And as you didn't show us your question with this subquestion relevance equation, it was difficult to say anything.

But the "verbatim" form is always better.

Joffm