Putting query loop into pro forms steps

Hey everybody!

I am trying to achieve this kind of functionality using nestable pro forms.

In my structure I have created a proform and put a table with a query loop that gets a list of CPT posts. I have put a checkbox in the first column.

I need the user to be able to sellect posts and then press the button, fill the contact info on the next step (that also shows chosen posts = values of selected checkboxes ) and send the request for the selected posts (products).

Is it possible with proforms?
Now I receive the warning " Warning : Undefined array key “id” in //wp-content/plugins/bricksforge/includes/elements/pro-forms/elements/Checkbox.php**

And also labels are shown despite “Don’t show label” enabled…