Deselect (empty) a lookup field

Deselect (empty) a lookup field

in On Edit / On Success of Form A I can manipulate a field (lookup/single-select) in Form B like this:

rec = formB [ID == 12345];
rec.lookupfield = "option 1"

... as long as 'option 1' is a valid selection in this field.

But how do I empty the field (it is not a required field)?

These 3 do not work:
rec.lookupfield = null;
rec.lookupfield = "";
rec.lookupfield = "-Select-";

Any suggestions?















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