EDIT: ALREADY HAVE IT (when working with Engagement Programs, the "used by" is not visible like other assets. It's listed under the "View" drop down).
We encounter this issue a lot - primarily with Engagement Programs. When attempting to delete a program, we're unable to since the program is being referenced in other smart campaigns outside of this program. There is a link to the program in the error window, but clicking on it does nothing:
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