Is there a way to clear the value (make it UNDEFINED) of a plain text multi-choice dropdown attribute once the the value is selected.
If you delete/clear the value, that value just automatically selects itself back. Maybe this is supposed to happen but it would be nice if it can be cleared. You wouldn't want a normal plain text attribute to do the same if value is cleared.
This is also the case with a reference attribute dropdown.
a) Plain text dropdown cannot be set to UNDEFINED by a rule.
b) Reference attribute can be se to UNDEFINED by a rule.
You have to have a value named '--None--' & use that instead. If you specify a value ' ' which would normally make the value blank, insted it changes the character '&' to ' ', making the value in the browser form look like ' nbsp;'
