How to trigger AP hold notification for custom invoice hold?

Summary:

Hi,

We have created a Custom invoice hold. We have a requirement to send notification to requestor if the custom hold is applied to the invoice. we have created an appropriate rule under "FinApHoldApproval" BPM task.

This is working as expected for seeded holds, but not sure how will it work for custom hold. Any help / hint will be appreciated.

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