Performance
In my UBE, I have two sections, main driver A and conditional section B. They both use the same business view (join between F0006, F090155 and F0911).
On section A, it's sequenced by F0006.MCU and I have a level break header. Inside the LBH, I call section B 13 times and each time, pass in a different begin and end dates.
In section B, it's sequenced by three fields, F0006.RP28, F0006.MCU, F0901.R003, in that order. I pass in the data selection from section A and add a few more for the dates. It has a Level break footer on F0006.MCU and it does all the calculation in there.