In SAP S/4HANA'sgraphical planning table(e.g., CM21 or PP/DS Planning Board, /SAPAPO/CDPS0), inserting an operation withforward planning direction(start from a fixed date and schedule forward) at a specific time on a work center with an existing operation:
* The new operation is inserted at the desired time; the previously dispatched operation is moved forward (C): With forward scheduling (configured in the strategy profile, e.g., /SAPAPO/CDPSC11, Planning Direction: Forward), the system inserts the new operation at the specified time (e.g., via drag-and-drop).
To maintain capacity feasibility, the previously dispatched operation is shifted forward (later in time) to avoid overlap, respecting the work center's finite capacity (CR02, "Relevant to Finite Scheduling" checked).
Options A and B (leaving the existing operation unchanged) would violate finite scheduling rules, causing overlaps. Option D (moving backward) contradicts forward planning, which schedules from the start point onward. This is per SAP's dispatching behavior in graphical tools.