In SAP S/4HANA PP/DS, theFinite Scheduling with Reversestrategy (configured in the strategy profile, transaction /SAPAPO/CDPSC11) schedules operations backward from a fixed end date, respecting finite capacity. To allow scheduling in the past (e.g., before today's date):
* Specify a negative offset time(A): In the strategy profile (Detailed Scheduling tab, field: Scheduling Offset), a negative value (e.g., -2 days) shifts the scheduling reference point into the past. This allows operations to be scheduled before the current date, accommodating scenarios where late planning or historical adjustments are needed, while still respecting capacity constraints.
Negative opening period(B) isn't a standard PP/DS parameter-it's a production order term (MRP 2 view) for order start buffers, not scheduling control.Negative planning horizon(C) (Planning Horizon in /SAPAPO
/CDPSC11) defines the future planning scope, not past scheduling.Negative PP/DS horizon(D) refers to the PP
/DS planning horizon (Customizing), which limits planning scope forward, not backward. This is per SAP's PP/DS scheduling configuration.