version 18.06 of the interviewer application provides for protection of the preloaded variables. This is okay for the roster trigger questions. How do I protect other variables that do not trigger any rosters?
Protection of variables is a feature that prevents interviewers from accidentally deleting existing data from interview.
If you need to prevent interviewer from answering question you can mark question is hidden in scope of questionnaire. https://support.mysurvey.solutions/questionnaire-designer/questions/question-scope-/
@innocent, note that ‘protecting’ in the sense that you’ve quoted is available at the level of an assignment. But protecting through a hidden question will protect it at the level of the questionnaire.
Depending on what you want to achieve this may or may not be a suitable workaround.