Yes, I did.  The default value for first and last name are set in the query.  I no longer get the "field cannot be update" message but when I click the command button to create a new record on the form, the "fullname" field still goes blank and it doesn't allow me to type anything in the box.  Sorry, I'm still pretty new at Access.

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Reply from Alex Hedley:

A record isn't created until you add some data
You won't now need to type into the Full Name this will be created automatically
Just add another field you would usually fill in.