Conversion Calendar Issue

We are moving one of our operating groups onto Oracle and we have an issue where they are on a 4-4-5 calendar (corporate is on a monthly calendar), We are moving them to a monthly calendar starting in the month of September, The issue we have is that the group does not want to restate the depreciation created by the 4-4-5 calendar for the first eight months of the year on the P&Ls and since the new main asset book we are loading to is on a monthly calendar the depreciation is adjusted to what it would have been had