How Demand Planning monthly planning split per weeks and real sales orders.
The data is disaggregated based on the storage bucket profiles and the type of time based disaggregation used for the specific KF.
e.g if you have selected monthly and week aggregation levels in the storage bucket profile then the data would be disaggregated to lowest level of weekly. It would be disaggregated based on the type of disaggregation used . it could be proportional, equal or based on other KF etc.
Let me know if it helps.