Some quick tips for Planning Data in SAP
The planning data is stored CE21000 (1000 is your operating concern)
This tables stores both Actual and Planned data. Use field VERSI to differentiate between Actuals and Plan.
The planning data can be entered manually or through excel upload.
A Planning layout needs to be configured in IMG that defines on what level the planning is maintained. For example, gross sales by customer/product or gross qty by customer etc.
KE16N - list of planning layouts
KE11 - Enter plan data manually
KE13N - Enter plan through excel