If you don't have a macro assigned to the checkbox, try assigning this to one:
Sub IfYouAreImNot1()
If ActiveDocument.FormFields("Check1").CheckBox.Value = True Then
ActiveDocuments.FormFields("Check2").CheckBox.Value = False
Else:
ActiveDocuments.FormFields("Check2").CheckBox.Value = True
End If
End Sub
and this to the other:
Sub IfYouAreImNot2()
If ActiveDocument.FormFields("Check2").CheckBox.Value = True Then
ActiveDocuments.FormFields("Check1").CheckBox.Value = False
Else:
ActiveDocuments.FormFields("Check1").CheckBox.Value = True
End If
End Sub
This is assuming the names of your checkboxes are Check1 and check2. Change if necessary.
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