Milestones can be baselined. CA PPM Gantt only provides an exclamation point added to the milestone image, indicating that it has slipped - there is no indication or pop-up providing the original, baseline finish date, as shown below - see "Milestone test," last task in chart:
MS Project, in its Tracking view, provides both an indicator for the original, baselined finish date for the milestone, but also its new, forecasted finish date:
Perhaps there is an "Opportunity for Improvement" on the design of the CA PPM Gantt chart?
Dale