[Master] - What If Impact on Planning and Supply

[v-rohangarg20]

Workitem Slice 636114: [master] [all-e] What-if analysis — Analyze negative impact of supply changes on demand

Fixes AB#636114

Issue: When a planner reduces the quantity, delays, or cancels a supply document (purchase / production / transfer order), there is no way to preview which downstream demand (production orders, transfer orders, sales orders) will be negatively impacted before committing the change. Today the planner must make the change, re-run planning, and manually compare the results.

Cause: No direct link exists between a supply document and the dependent demand it covers — the impact can only be traced by re-running the full planning engine and comparing reservations. There was no programmatic "what breaks if this supply line changes?" primitive to surface it up front.

Solution: Added a "What-If" action on the purchase / production / transfer order subforms that opens a simulation. New codeunit 5455 "Supply What-If Planning Engine" (with temp tables "Supply What-If Scenario" and "What-If Impact", and the "Supply What-If Scenarios" / "What-If Impacts" pages) runs the existing planning engine in preview mode — CarryOutActionMsgPlan.SetSimulationMode against the user's temporary requisition worksheet lines — reads the impacted outbound reservations, and lists the affected documents, all without persisting any change. Also guards invalid input (no change to simulate, What-If Qty > Original, What-If Date < Original). Phase 1 covers negative scenarios and 1-level direct impact; validated with 11 new tests in SCMPlanningAndManufacturing.Codeunit.al.

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