Control Record Earliest Retro Change

Hi

  Thought of discussing and getting information from the group on these points listed below:

1) Is it a right/common practice to change the Earliest retro acctg period in the control record every year. For example if the customer decides the system should not retro back into previous year?

2) Ideally what is the right time to delete the existing control record and create a new one with the new Earliest retro period? We are currently planning to do it just to the start of the 1st period in the new year.

Thank you