If I add a lookup column to a list and specify that it is NOT required, a choice appears at the top of the drop-down list for that column with the value "(None)". However, when I select that choice, and then attempt to save the item, I receive the following error message in a dialog:
The list item could not be inserted or updated because invalid lookup values were found for the following field(s) in the list: [MyLookupFieldName].
I receive the same message if I completely clear the field (which is not easy to do!).
Anyone else getting this, is it a known bug, and is there a decent workaround?
