Combobox giving me a warning

I'm trying to select a record from a combobox on a form.  Suddenly it give me an error when I click the choice I want...

Update or canceupdate without addnew or edit

???
SteveL13Asked:
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mbizupNerdCommented:
What code do you have associated with the combo box?
SteveL13Author Commented:
None.  But I tried something.  I added Me.Dirty = False to the afterupdate event of the field and the problem went away.  I don't understand what this is doing to make it work.
mbizupNerdCommented:
Strange - it sounds like your sombo box's row source might be dependent on the same table(s) as your form  (Just a guess).

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