If an expression is correct, it is confirmed with a green flag and the message Expression is valid is displayed.

If an expression uses invalid syntax, an error (yellow flag) or warning (red flag) is displayed, together with information that helps you to correct the syntax.

When there are type mismatches, the dynamic expression engine implicitly converts types where possible. For example, when it expects data of type String but the validation result is Boolean, the engine confirms the expression and generates a warning that suggests that you use a different function (or rely on the implicit conversion). You can choose to proceed with the defined expression, or you can modify it.

If the type conversion is undefined, for example, when trying to convert data of type Date to type Boolean, the editor generates an error message. You can choose to proceed with the defined expression, or you can modify it.