the calves, R1, R2 classes aging up at end of finance year does not work for dairy. one of the groups need to be dumped.
A heifer born august 2020, will be a calf in farm focus till end of may 2021, then she will be a R1 (or Y1) till end of may 2022, when she will be a R2. But by then she is about to calve and should be in the MA.
There is no example of dairy in the 'aging stock' help file, only sheep and beef. For dairy it does not add up