Errors in the Technical Rule Editor
The Technical Rule Editor dynamically checks the correctness
of the code in a technical rule.
As you type in the Technical Rule Editor, it shows errors and warnings:
Invalid code is underlined.
Errors are displayed in the Technical Rule Editor margin.
Both the Technical Rule Editor margin and the underlined code have tooltips that contain the error messages.

Errors are underlined in red. Warnings are underlined in yellow.