How can I set a value of a check box after submit?
I clicked the check box and when I click in the submit button, it deselects.
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Having looked at the example you linked to in a comment above, I think your checkbox item is not set up correctly. Looking at the URL in the browser after checking the checkbox and pressing the Apply button I see:
That explicitly sets the values of the checkbox item to NULL, which is normally the unchecked value. As an experiment I changed the URL to:
The page reloaded with two checkboxes!:
So how is your checkbox item defined? It should be defined something like this:

i.e.
Also, you don’t want to reset P555_CHECK to null in the page branch.