I setup the full name field in my query as instructed in this lesson, then added that field to my form.  I then set a default value in the properties for that full name field to one employee so that he doesn't have to keep typing his name in the field for every record he adds.  When I try to add a new record, though, Access opens a window that says, "Field cannot be updated."  When I click okay, I can then continue on but the full name field is blank.

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Reply from Alex Hedley:

Was it the Default Value you set or the Control Source?
With it being joined you may need to set the Default Vaule of the First and Last name fields so the query joins them