The default functionality in Precursive when you change a project owner on a project where Timesheet Codes are already approved, the Project Manager also changes.
The new feature allows you to keep it as it is, without project manager's change.
It is manageable by a custom setting called "Keep project manager on approved TSC". When it is set to true and you change the project owner, theproject manager for already approved Timesheet Codes won't change.
To switch it go to Setup > Custom Settings > Preempt Global Settings > Manage > Global.
Find on the list 'Keep project manager on approved TSC' and set it as true or false. Then save changes.