Future Cost Update (R41052) - All documentation examples use the 05 (Future Cost) to update other co

We use other user defined cost methods to hold new revalue costs by year. This coming year, we will use cost method 34 to hold the 2014 costs. For revaluation - we want to use the R41052 to copy the 34 costs to the 07 costs. We've tested this and it seems to be fine. However, since all documentation always refers to 05 as the example for future costs - we just wanted to see if there was a reason why it is always assumed for 05 - or if it was just because 05 happened to be named 'Future Costs'. Thanks!   Mindy