When to change the Balance Date:

1. Change the Balance Date if you are looking to evaluate the effect of some specific process change or investment that happened since, or to included mills that were closed since.
2. Keep the latest available Balance Date if you want to compare the latest operational setup with different unit costs. It will keep the mill data consistent at the latest available status, and only change the cost date.
3. There is no need to change the Balance Date if you are using the Trend option in Market or Mill levels.