Promise and Reserve Stock Before It Arrives
Use Case
Author:
Holger Lierse
Changed on:
6 Apr 2026
Problem
Many businesses commit to customer orders before the stock needed to fulfill them has physically arrived. Whether managing pre-orders for a product launch, securing wholesale allocations ahead of a season, or coordinating inbound shipments across multiple purchase orders, the gap between when stock is promised and when it is received creates significant operational risk.Without the ability to track and reserve future stock explicitly, businesses commonly experience:- Overpromising on availability. Without visibility into what is already committed against inbound stock, sales and operations teams cannot accurately promise delivery dates to customers.
- Inability to support pre-orders. Without a mechanism to reserve future stock at the point of order, pre-orders must either be held manually or risk being oversold before the goods arrive.
- Poor inbound stock visibility. Purchase orders and in-transit shipments are not reflected in the inventory system in a way that allows stock to be reserved or promised against them before arrival.
- Reactive rather than proactive fulfillment planning. Without forward-looking availability data, fulfillment teams cannot make confident sourcing decisions for orders with future delivery windows.
Example
A consumer electronics retailer was preparing to launch a new gaming chair and wanted to open pre-orders ahead of two inbound shipments arriving in January and February. The business had 100 units already on hand but needed to manage pre-order commitments against future supply that had not yet been received.Without a way to track and reserve against inbound purchase orders, the team managed pre-order commitments manually, cross-referencing spreadsheets against expected purchase order quantities to estimate how many pre-orders could safely be accepted. Delivery date promises were based on estimated arrival windows rather than confirmed quantities, and the team had no reliable way to know at any point how many units from each shipment were still available to promise. As pre-order volumes grew ahead of the launch, the manual process became unsustainable, leading to oversold allocations, inaccurate delivery promises, and significant operational overhead managing customer expectations.
Solution Overview
Fluent Commerce OMS solves this by providing an inventory model to represent stock that is not yet physically available but is expected to arrive at a known point in time. Expected stock can be tracked through its full inbound lifecycle, reserved against before receipt, and exposed as time-series availability, giving teams an accurate forward view of what can be promised and when.How it works at a glance:Inbound stock is recorded with an expected arrival date and linked to its source (such as a purchase order or in-transit shipment). Reservations can be placed against this future stock before it arrives, reducing the available-to-promise quantity for that delivery window. Availability can then be queried as of any future date, returning an accurate, commitment-aware picture of what can be promised at that point in time.1. Track Inbound Stock Through Its Full Lifecycle
Expected stock is recorded against a specific product and location with an arrival date, and linked to its operational source such as a purchase order or in-transit shipment. As the stock progresses through its inbound lifecycle, its status is updated to reflect each stage, from on order through in transit to received.
- Inbound stock is tracked as part of the same inventory record as on-hand stock, preserving a single view of total inventory per product and location.
- Each stage of the inbound lifecycle is represented explicitly, giving operations teams full visibility into where stock is and when it will be available.
- Reservations and commitments made against future stock remain correctly anchored as the stock transitions through lifecycle stages.
Orders can be committed against inbound stock before it is physically received. This reduces the available-to-promise quantity for that delivery window at the point of reservation, ensuring subsequent orders see accurate availability.
- Reservations are anchored directly to the specific inbound quantity they are committed against, ensuring promise quantities are reduced at the correct scope.
- Pre-orders and wholesale commitments can be taken against future supply without risking oversell.
- If an inbound quantity changes (for example, a purchase order quantity is revised or a delivery date shifts), the impact on committed reservations is immediately visible.
Available-to-promise quantities can be retrieved as of any future date, returning the availability at that point in time. This accounts for on-hand stock, all expected inbound arrivals up to that date, and all reservations already committed against those quantities.
- A single availability query can return what is available now, as of next week, or at any future date.
- Availability projections are commitment-aware: reservations already placed against future stock are reflected in the quantity returned.
Operations and commercial teams gain a forward view of inventory availability, enabling confident sourcing decisions, accurate delivery promises, and proactive planning across future supply.
- View current Available-to-Sell alongside projected Available-to-Promise at any future date.
- Identify inbound stock already committed versus what remains Available-to-Promise.
- Respond quickly to changes in inbound supply, such as delayed shipments or revised purchase order quantities, with an immediate view of the downstream impact on committed orders.
