My UD8 formula is not running! Why?

The system looks for formulas on members of the Point of View in this order: Account -> Flow -> UD1 -> UD2 -> UD3 -> UD4 -> UD5 -> UD6 -> UD7 -> UD8.

As soon as a formula is found and executed, the process stops. So if you placed a formula on the Account, for example, UDs will never be executed.