as suggested, you need to create a forecast in BC, then use that forecast when running item planning or requisition worksheet. the forecast will be treated as demand and will net against sales order.
so if i add for item A the table above: e.g. 30 in Jan 23 and run the full planning, the system should suggest 30 for Jan 24 (if starting date and ending date is: 01/01/24 and 01/31/24).
Note: which setup should be done on the item card?
The Business Central planning engine (MRP, MPS) does not take into accounted posted sales. It only takes into account existing demand which can come from two things - open sales documents and forecasts. To plan purchasing based on sales quantities from the previous year, you will have to create a demand forecast yourself - Create a Demand Forecast - Business Central | Microsoft Learn. The forecast would be based on your sales data from the previous year.
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