Lock or Freeze Allocations

Is there a way to "lock" or "freeze" allocations to the day/week/month in which they are assigned even if the dates shift? Think of it like using a "$" in an excel formula to lock something in place. 

• As a resource manager, I allocate the hours based on discussion with my team member. 
• As a project owner, I added planned hours, added other users, or I adjusted the dates of the task because others need to start work earlier or end later.
• The change made adjusts the allocation efforts the resource manager did. The resource manager set the allocations in the day/week/month specifically and does not want it to change. Can this be locked?