AVCs to be able to recalculate the amount the percentage is based off.

Currently when using the 'Employee Penson AVC %' pay element the value the percentage is based on needs to be manually updated if other values such as the salary changes.

This creates extra manual work so the Idea is for the AVC to work the same way the pension does, so it can be based on the Total Pay, Salary or Qualifying Earnings in the period and automatically update based on this value.