I created a section and used
"Hide paragraph if formula is true" for the section with the following content:
where bstauss is a text fieldname.
somehow even if the bstatus shows a value of "submitted" the section
is still visible to the users.
In the same form there is another section which checks the value of the bstatus field for hiding.
However sometimes only the section header is hidden when the formular evaluates to true.