Cannot Use Category Field in Requesition Visual Builder

Hi All,

I wold like to added a hint for specify category when create request.

So I added validation in Visual builder like below, but it not works:

while I changed the condition and target fields , it works:

The page likes below:

It seems the CategoryName's value is not correct and cannot be set as target fields.

May I know why?

Thanks in advance!

Version (include the version you are using, if applicable):

25A