Checkbox unchecked not saved

Hi,

I have a little problem with my checkboxes :
1

On a page, I have several checkboxes and when I click on my Add/Modify button which launches a workflow to create or modify a thing, it only saves the data if the box is checked to save Yes, but if it’s unchecked, there is no info. I tried in the workflow to add after “is checked” a “formatted as text”, but I’m asked for another parameter and I don’t see what to choose :
3

Is there a solution (at least I add the No myself in the database, because it’s a personal app but if I create apps for clients it could be annoying knowing that I have yet choose No as default in database)?

Thank you.