Dynamics 365 F&O and Infor LN Plan Replenishment Almost Identically, Study Finds

A technical analysis published by CodeCore Dynamics LLC on 9 September 2026 compared master planning replenishment logic in Microsoft Dynamics 365 F&O and Infor LN, finding the two systems behave nearly identically in most lot-sizing scenarios. Five business cases built from two years of a UK wholesaler's order data tested eleven lot-sizing settings each, with a floating demand window topping all five cases. The study found that service levels barely differ across time-phased rules at short lead times, with fill rate spreads under 0.2 points in three of five cases. A key F&O risk identified is the coverage time fence: setting it below the total lead time costs roughly half a percentage point of fill rate per day without triggering any system error. The analysis concluded there is no planning-based justification for migrating from F&O to Infor LN, and that a company's current planning position can be assessed with just three targeted questions to the planning team.