If you have an asset that has a first use date straddled between multiple part-payments, you may have some mismatches between opening balances and written down values of an asset when it is time to start depreciating it (at first use).
The solution is either not adding the First Use date until all Additional Costs have been applied prior to that date,
Or
Reversing the First Use, applying Additional Costs and then Reapplying the First Use date.