If you use Boolean validator with math, date-time or text-string terms you have to use the following configuration:
Text to be parsed: %{13700.1} = "Incidencias"
Note that:
Field code for field "Área/Subárea" is %{13700}.
This field code depends on each Jira instance. You can find the code for you particular Jira instance in the field list available the validator configuration screen.
Once configured, your transition will look like this:
You can also use another feature of Jira Workflow Toolbox: Validation based on regular expression. If you use that feature you should use the following configuration:
Boolean validator with math, date-time or text-string terms
Validation based on regular expression