Why isn't EPDM Dispatch Action triggered by Check in?

I wanted to use a dispatch action to check some card variables as a drawing was being checked in.  The action worked fine when triggered by a menu command, however did not work when I tried to link it to the check in process.  Subsequently I have tested a number of simple action but can't get them to work using the check in activation.  All the other activations work as expected, including check out.

Is there a problem with my Action or has anyone else experienced this issue?

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