Because we proactively separate a member’s submission data from their 
  Member ID when compensation data is submitted, it enables us to 
  secure the system in such a way that we cannot even support the 
  ability for a member to update their previously submitted salary 
  information - they have to resubmit.

How is this possible? If the salary data is not associated to the user in any way can't a user submit their salary over and over again drastically swaying the aggregate salaries?