Thanks so much for your prompt reply! I tried implementing the code as an Event in the subform property. When I compiled the code, the system threw an error: Invalid use of Null.
Access would not let me use the procedure Form_Dirty(), so this is the code I ended up using. The procedure is the default if I go to Form->Properties->Event->On Dirty.
Code:
Private Sub Form_Dirty(Cancel As Integer)
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