Master planning (MRP) module in Dynamics 365 F&O and Infor LN

Dynamics 365 F&O and Infor LN size replenishment orders almost identically. The difference is one F&O setting. The coverage time fence costs about half a point of service for every day it is set below the lead time, and raises no error. CodeCore Dynamics LLC. 9 September 2026. Summary Master planning decides how much of the future to plan and at what resolution. The whole horizon at full detail returns proposals for orders that need no decision for months. Too short a horizon and long lead time items arrive late. The two products agree almost entirely on lot sizing. One order per requirement, a floating time window and replenish-to-maximum exist in both. The window opens at the first demand in each, and neither product anchors it to the calendar. LN adds Fixed Order Quantity and Economic Order Quantity . F&O adds priority-based replenishment and a decoupling point. Neither product contains the other's full set. The setting to tune is how much demand one order covers. It is a working capital decision, not a service one. Doubling the window removes 39 per cent of the purchase orders and adds 126 per cent to the stock, at an unchanged fill rate. The right window length differs by business. 56 days suited the spare parts operation, 7 and 14 days the short lead time cases. Five business cases were built from two years of a UK wholesaler's order lines, and eleven lot-sizing settings ran in each. The floating window came top in all five. The two methods only LN documents never placed better than third of eleven. Four of the five cases were ties, decided by 0.13 to 2.81 points on a hundred point scale. Only the spare parts case separated, at 9.93 points, and it went to a setting both products offer. Service barely separates the time-phased rules at short lead times. Fill rate spread by under 0.2 points in three of the five cases, and by 2.8 and 4.3 points where the lead time reached 60 and 45 days. LN's coarse planning tier is optional, set per item, and Infor advises again