v15.2 - How to attach a CMMN milestone to a resource allocation?

[Paolo F Cantoni]

The Resource Allocation Help says:
Milestone
This checkbox and drop-down list allow linking the end date to the date of a Milestone element that is no more than seven days old. (Milestone elements form part of the structures developed using the MDG Technology for CMMN, the Case Management Model & Notation, which you can access through the Analysis Perspective.)

So I've created a few CMMN milestones, but nothing appears in the dropdown.  What's the secret sauce?

TIA,
Paolo

[Paolo F Cantoni]

I have received a reply from Sparx Support:
For some reason, the help has named the wrong Milestone element. Please use the Construction > Project Management perspective and you will find a Milestone stereotype with a tagged value named 'Date'. This is the milestone that is expected.

I have confirmed that using the correct milestone vertex metatype will add the milestone to the dropdown.

Paolo