Your code relies on there being two Custom Document Properties in the document - Chk1 and Chk2. Only Chk1 exists in your attachment.
It is far from clear as to why you would want two checkboxes, as clicking any checkbox one or more times will toggle its checked state on/off each time. Nevertheless, I've added the Chk2 Custom Document Property and revised the code so that only one checkbox can be checked.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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