For a field that is of Input Type select (single), which gets populated by a data retrieval rule, once it is populated, it does not seem like I am able to set this field back to NULL (nothing selected, like when the form first loads) via the Set Value rule action. It just retains the previously selected value in the field. Same thing if the data retrieval rule does not return any rows/data -- it just leaves the previously set value in the field.
Is this expected behavior or am I doing somethign wrong?
Thanks for your reply. If we physically set and mimic what the null visually looks like by using three hyphens, then the field actually holds a value so we lose the OOTB required field empty check/notification, correct? Any suggestions regarding that?