Dynamics 365 Master Planning Pegging vs Marking vs Reservation: Understanding Supply Chain Connections
Navigating supply chain connections in enterprise resource planning can be complex, especially when tracking how inventory satisfies demand. In Dynamics 365 Master Planning, understanding the distinct behaviors of pegging, marking, and reservation allows supply chain professionals to control inventory allocation, troubleshoot shortages, and prevent unexpected disruptions in manufacturing and fulfillment workflows.
Key Takeaways
- Pegging is the automatic connection made by Dynamics 365 to match demand with available or expected supply.
- Marking creates a manual, fixed link between a specific supply transaction and a demand transaction.
- Reservation establishes the strongest hard link, setting aside physical inventory or incoming supply so it cannot be used elsewhere.
- Understanding these three connection levels helps planners troubleshoot inventory shortages and supply chain bottlenecks effectively.
Understanding Supply Chain Connections in Dynamics 365
When managing complex manufacturing environments—such as assembling bicycles where a single customer order triggers requirements for frames, wheels, chains, and custom components—visibility into how supply meets demand is critical. Without proper tracking, warehouse managers and procurement specialists can easily misinterpret stock availability. Dynamics 365 Master Planning solves this by evaluating net requirements, but the real power lies in understanding how the system connects individual demand lines to specific supply sources.
Planners frequently need to answer a very specific question: Which exact supply line covers which specific demand line? To answer this, Dynamics 365 provides three distinct levels of connection: pegging, marking, and reservation. Each level offers a different degree of system automation and manual control over inventory and procurement.
Pegging: The System's Automatic Match
Pegging is the fundamental, automated mechanism that Dynamics 365 uses to link demand with supply. During a master planning calculation, the system reviews customer orders, forecasts, production requirements, and transfer requests, then scans available on-hand inventory, open purchase orders, and planned orders to find matches.
If a customer places an order for 70 bicycles, the planning engine automatically pegs that demand against available inventory or incoming purchase orders for components like wheels and frames. If an inbound purchase order for wheels arrives before assembly begins, pegging connects that supply directly to the production need. However, pegging is flexible. If a customer changes their delivery date or a supplier delays a shipment, the planning engine will automatically recalculate and adjust the pegging links during the next planning run.
Marking: Manual and Fixed Relationships
While automatic pegging handles routine day-to-day fluctuations efficiently, planners sometimes require greater stability. This is where marking comes into play. Marking is a manual connection established between a specific supply transaction and a specific demand transaction.
Think of marking as placing a permanent label on two related records. When a planner marks a specific incoming purchase order of specialized bicycle frames against a particular high-priority production order, the system respects that relationship more firmly than standard pegging. The planning engine will not freely reallocate those marked frames to another order, even if a more urgent demand pops up elsewhere. Marking gives supply chain teams localized control over critical inventory without requiring a rigid, physical stock reservation.
Reservation: The Strongest Hard Link
The highest level of connection in Dynamics 365 is reservation. When you reserve inventory or incoming supply for a specific demand source, you create a hard link that overrides normal planning flexibility. Reserved stock is explicitly set aside and locked for that particular sales order, production order, or transfer request.
Master planning treats reservations with ultimate priority. If 10 bicycle wheels are sitting in the warehouse, but those wheels are fully reserved for an urgent repair order, the planning engine cannot treat them as freely available for upcoming bicycle production lines. If additional customer orders require wheels, the system sees the shortage caused by the reservation and immediately generates new planned purchase orders to cover the gap. This prevents operational overlap and ensures that high-priority commitments are never accidentally starved of inventory.
Conclusion and Next Steps
Mastering the nuances of pegging, marking, and reservation allows supply chain professionals to transition from reactive firefighting to proactive inventory management. By understanding how Dynamics 365 connects every demand signal to its corresponding supply source, planners can maintain absolute clarity over their manufacturing and procurement pipelines.
To explore these supply chain strategies and learn more about connecting customer demand, inventory, and production schedules, Listen to the full episode. Tune in to gain actionable insights for optimizing your Microsoft 365 and Dynamics 365 environments.
Frequently Asked Questions
What is the primary difference between pegging and marking in Dynamics 365 Master Planning?
Pegging is an automatic system-generated link created during a planning run to match demand with supply, whereas marking is a manual connection that explicitly locks a specific supply transaction to a specific demand transaction, overriding regular planning adjustments.
Does a reservation take priority over regular pegging in Dynamics 365?
Yes, reservations take priority over normal pegging and marking. When inventory or incoming supply is reserved, master planning treats it as a hard commitment that cannot be freely allocated to other incoming demands.
When should an inventory reservation be used instead of standard pegging?
Reservations should be used when physical stock or incoming shipments must be strictly protected for urgent, high-priority orders—such as specific customer shipments or emergency repair parts—to prevent the planning engine from reallocating those units.
Can Dynamics 365 automatically update pegging links if a supplier changes a delivery date?
Yes, pegging links are dynamically recalculated during master planning runs. If an inbound purchase order slips or a customer adjusts their delivery date, the system's automatic pegging will adjust or suggest new planned orders to cover any resulting gaps.
