I'm wondering wha the best practice it for this issue. Here is a simple example
Complete Roof (Agreed owner milestone) 1 March 2022. Constraint is "Finish On or Before".
It's predesessor activity is Install Roof and Flashing. If this activity is showing a week early completion then the milestone also shows early completion; this gets confusing as the milestones are important commercial turnovers and we don't want them to change everytime we update the schedule. Now if the predecessor is going to finish on 10 March 22, then I can can see 10 days neg total float which tells me its critical and going to be late. I like this information.
However if i use Finish On. It just finishes regardless of its predecessors and shows Total Float as 0.
If I use "Finish On or After" then it finishes either on or later but the total float is calculated to the project "Must Finish By" date.
A cumbersome solution is to write the miletstone date in the activity name and use "Finish On or Before"
Anyway I hope that the question is clear. Please let me know what options i have for something like this.