Forecast consumption not deducting shipped quantities , Planned Orders generated for already-fulfill

Business Requirement:
When actual shipments equal or exceed the forecast for a given week, the Net Forecast should reduce to zero, and no Planned Orders should be generated for that week.

Current Behavior:
Net Forecast only deducts open Sales Orders from Gross Forecast. Shipped quantities (Final Shipments History) are not consumed against the forecast. This causes Planned Orders to be generated for demand that has already been fulfilled.

Example:
ITWM: XXXXXXXXXX — [Title masked]
Plan: [Plan Name masked]
Week: 4/27/26
Gross Forecast: 5,610
Final Shipments History: 5,610 (fully shipped)
Net Forecast (actual): 5,599 (only 11 units consumed via open Sales Order)
Net Forecast (expected): 0
Planned Orders (actual): 5,200 (expected: 0)