By ticking on Show declared DSL sentences  (regardless whether you have DSL definitions yet in your project), a rule is created as a rdslr file. This type of file will fail for something as simple as trying two  from statements in the same rule: This rule doesn't validate and the project's build shows the following errors: The same rule validates and compiles when is written as a rdrl file i.e. when you don't tick Show declared DSL sentences: Note in this simple project there was not attempt to use DSL Definitions and still the rdslr file fails to validate and compile. For real projects this problem means we cannot use DSL Definitions in a Guided Rule.