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5 Retail Inventory Visibility Challenges and the Role of OMS

8 min read
Two warehouse workers walking down a long aisle between tall pallet racks stocked with goods

Quick summary

  1. Inventory visibility means knowing what stock you have, where it is, and how much is already reserved for customer orders.

  2. Outdated stock numbers and hidden incoming stock lead to overselling and canceled orders.

  3. When stores, warehouses, and regions use separate systems, nobody sees the full picture.

  4. An order management system (OMS) keeps one stock record for every sales channel and ships each order from the best location.

  5. Everest helps retailers set up Manhattan Active® Order Management, as in our case study of three brands upgraded in one program.

What is inventory visibility?

Inventory visibility is the ability to see, in near real time, how much stock you own, where it sits, what is on its way, and how much is already committed to customers. It spans stores, distribution centers, in-transit shipments, and every sales channel. The purpose is simple. When a customer sees “in stock,” you should be able to deliver.

One item, four answers

How much you own
The total quantity of the item you hold.
Where it sits
Each store and distribution center holding it.
What is on its way
Stock on in-transit shipments.
What is committed
Stock already promised to customers.

The test: across every sales channel, “in stock” should mean you can deliver.

Why inventory visibility challenges matter

Canceled orders, overselling, and unnecessary markdowns often trace back to systems that disagree about where product is, rather than to a true shortage. Every canceled order costs the sale, the refund handling, and some customer trust. Retailers meet these stock visibility challenges in different forms, and the five below are among the most common.

1. Real-time inventory visibility challenges: stale stock data

Stores, warehouses, and ecommerce platforms often sync in batches. Between syncs, one unit can be sold twice, or an available item can show as sold out.

Batch sync compared with event-based updates Two timelines for the same item. With scheduled batch sync, a store sells the last unit, but the website keeps showing it in stock until the next sync and takes an order for it, so the unit is sold twice and an order is canceled. With event-based updates, the sale is published as it happens, the website shows sold out at once, and no second sale is taken. Stock on the shelf Stock the website shows Scheduled batch sync Systems update each other in batches SYNC NEXT SYNC Visibility gap The unit is gone, but still for sale Website takes an order for it Store sells the last unit ! Sold twice: order canceled Event-based updates Each change updates every channel Update published as the sale happens Store sells the last unit Shows sold out: no oversell Batch sync compared with event-based updates Two timelines for the same item. With scheduled batch sync, a store sells the last unit, but the website keeps showing it in stock until the next sync and takes an order for it, so the unit is sold twice and an order is canceled. With event-based updates, the sale is published as it happens, the website shows sold out at once, and no second sale is taken. Shelf stock What the website shows Scheduled batch sync Systems update each other in batches SYNC NEXT SYNC Visibility gap 1 2 3 1 Store sells the last unit 2 Website still takes an order for it 3 Next sync: sold twice, order canceled Event-based updates Each change updates every channel 1 2 1 Store sells the last unit: update sent at once 2 Website shows sold out: no oversell
Figure 1. Between batch syncs, the website can sell stock the shelf no longer has. Event-based updates close that gap, and they also keep an available item from showing as sold out while it waits for the next sync.

The fix

The fix starts with making the OMS the central inventory record. It receives updates as stock and orders change and publishes current availability to every channel.

How a system gets its updates matters more than how often it checks for them, so favor event-based updates over scheduled polling.

2. Confusing on-hand stock with available to promise

On-hand stock is what is physically present. Part of it may already be reserved for accepted orders, held for a single channel, or unsellable. Selling against on-hand numbers is a common cause of overselling.

From on-hand stock to available to promise An illustrative waterfall, not to scale. On-hand stock minus unsellable units gives sellable stock. Minus stock reserved for accepted orders and stock held for a single channel, plus confirmed inbound stock where policy allows, gives available to promise, the number to send to every selling channel. Selling against the on-hand number oversells. How on-hand stock becomes available to promise ILLUSTRATIVE, NOT TO SCALE MINUS EQUALS MINUS MINUS PLUS EQUALS On hand Physically present Unsellable Sellable stock Reserved for accepted orders Held for a single channel Confirmed inbound, where policy allows Available to promise ↑ Selling on this number oversells Send this number to every channel ↑ From on-hand stock to available to promise An illustrative waterfall, not to scale. On-hand stock minus unsellable units gives sellable stock. Minus stock reserved for accepted orders and stock held for a single channel, plus confirmed inbound stock where policy allows, gives available to promise, the number to send to every selling channel. Selling against the on-hand number oversells. On hand to available to promise ILLUSTRATIVE, NOT TO SCALE On hand Selling on it oversells MINUSUnsellable EQUALSSellable stock MINUSReserved for accepted orders MINUSHeld for a single channel PLUSConfirmed inbound, where policy allows EQUALSAvailable to promise (ATP) ↑ Send this number to every channel
Figure 2. Available to promise is sellable stock, minus existing commitments, plus confirmed inbound stock where your policy allows. Channels should sell against that number, not the raw on-hand count.

The fix

Calculate available to promise (ATP) instead: sellable stock, minus existing commitments, plus confirmed inbound stock where your policy allows. Send ATP to your selling channels in place of the raw on-hand count.

3. No view of in-transit and incoming inventory

Stock on a supplier shipment or an inter-store transfer is invisible to selling channels. Retailers then turn away sales they could have filled, or quote delivery dates they cannot meet.

The fix

Connect purchase orders, advance ship notices, and transfer data from the ERP to the OMS. Include inbound stock in availability, paired with a realistic delivery date.

From the ERP

  • Purchase orders
  • Advance ship notices
  • Transfer data

Into OMS availability

  • Inbound stock counted
  • Realistic delivery date

4. Siloed stores, distribution centers, and channels

When each location and channel manages its own stock, inventory sits idle in one place while another runs out.

The fix

Omnichannel order management combines orders and inventory across locations, then applies sourcing rules such as distance, stock depth, cost, and delivery date to decide where each order ships. This supports ship-from-store, buy online pick up in store (BOPIS), and home delivery.

Sourcing rules weigh

  • Distance
  • Stock depth
  • Cost
  • Delivery date

So orders can ship by

  • Ship-from-store
  • BOPIS
  • Home delivery

5. Global inventory visibility across regions

Selling worldwide adds warehouses, currencies, tax rules, and delivery constraints. A single blended stock number rarely works at that scale.

Inventory segmented by market under one global view A global view of stock across all regions, warehouses, and sales sites sits above three market segments. Each market has its own storefront and its own currency, tax rules, and delivery constraints, and its storefront sells only from the warehouse and store that can serve it. A location in one market is blocked from another market's storefront. Global view Stock across all regions, warehouses, and sales sites ABOVE THE SEGMENTS MARKET A Market A storefront Warehouse Store Own currency, tax rules, and delivery constraints MARKET B Market B storefront Warehouse Store Own currency, tax rules, and delivery constraints MARKET C Market C storefront Warehouse Store Own currency, tax rules, and delivery constraints Sells from this location Blocked: the location cannot serve that market Inventory segmented by market under one global view A global view of stock across all regions, warehouses, and sales sites sits above three market segments. Each market has its own storefront and its own currency, tax rules, and delivery constraints, and its storefront sells only from the warehouse and store that can serve it. A location in one market is blocked from another market's storefront. Global view All regions, warehouses, and sales sites MARKET A Storefront Warehouse Store Own currency, tax rules, delivery constraints MARKET B Storefront Warehouse Store Own currency, tax rules, delivery constraints MARKET C Storefront Warehouse Store Own currency, tax rules, delivery constraints Sells from this location Blocked: cannot serve that market
Figure 4. Each market sells only from locations that can serve it, while one global view still covers the whole network.

The fix

Segment inventory by market and channel, so each storefront sells only from locations that can serve it, and keep a global view of the whole network above those segments.

The role of an OMS in inventory visibility

An order management system (OMS) sits between your sales channels and your back-end systems, such as ERP, warehouse management, and point of sale. The store register is one of its busiest data sources, which is why POS implementation problems so often surface later as inventory problems.

Where an order management system sits Back-end systems, ERP, warehouse management, and point of sale, send stock and order data into the order management system. The OMS keeps one inventory record, calculates available to promise, counts incoming stock, and picks where each order ships. It publishes available to promise to the website, stores, and other channels, and receives their orders. Sourcing rules send each order to the best store, warehouse, or vendor. BACK-END SYSTEMS ORDER MANAGEMENT SALES CHANNELS ERP Purchase orders, transfers WMS Warehouse management POS Point of sale Stock and order data flow in OMS Order management system 1 One inventory record 2 Available to promise 3 Counts incoming stock 4 Picks where orders ship Website Stores Other channels ATP ATP ATP ATP goes out, orders come in SOURCING RULES Store Warehouse Vendor Each order ships from the best location Where an order management system sits Back-end systems, ERP, warehouse management, and point of sale, send stock and order data into the order management system. The OMS keeps one inventory record, calculates available to promise, counts incoming stock, and picks where each order ships. It publishes available to promise to the website, stores, and other channels, and receives their orders. Sourcing rules send each order to the best store, warehouse, or vendor. SALES CHANNELS Website ATP Stores ATP Other channels ATP ATP ORDERS OMS Order management system 1 One inventory record 2 Available to promise 3 Counts incoming stock 4 Picks where each order ships Best store, warehouse, or vendor Stock and order data ERP Purchase orders WMS Warehouse POS Point of sale BACK-END SYSTEMS
Figure 3. The OMS sits between your sales channels and your back-end systems. The numbered jobs match the list below.

It does four jobs that answer the challenges above:

  1. Keeps one inventory record.

    It collects stock data from every location and channel, so everyone sees the same numbers.

  2. Calculates what you can promise.

    It works out available-to-promise stock and shares it with each channel as orders and stock change.

  3. Counts incoming stock.

    It brings in purchase order and shipment data, so inbound inventory is part of availability.

  4. Decides where each order ships.

    It applies your sourcing rules to choose the best store, warehouse, or vendor for every order.

Without an OMS

Each channel works from its own numbers.

With an OMS

“In stock” on your website becomes a promise you can keep.

Case study: three brands on one omnichannel platform

Case study U.S. specialty apparel retailer

A U.S. specialty apparel retailer needed to move from an on-premises omnichannel fulfillment system to a cloud-based, microservices-driven Manhattan Active® omnichannel platform. The goal was to upgrade three brands in a single program, while the team was still building skills on the new platform. An earlier implementation with a different vendor had covered a single brand.

Earlier implementationDifferent vendor

1 brand

Everest Technologies upgradeOne program, on Manhattan Active®

3 brands

Everest Technologies completed the upgrade for all three brands in one program.

What the project faced

  • Frequent infrastructure changes
  • Unstable environments
  • Complex third-party integrations

What it delivered

  • High stability and quality before go-live
  • Faster resolution cycles
  • Improved product quality
Read the full case study

The takeaway

Better visibility depends on disciplined integration and testing, not only on software selection.

Questions to ask before choosing an OMS

OMS evaluation checklist

5 questions

  • Does it publish ATP to every channel in real time?ATP
  • Can business users change sourcing rules without custom code?Sourcing
  • Does it integrate with your ERP, WMS, POS, and ecommerce platform?Integration
  • Does it handle inbound inventory and market segmentation?Inbound
  • How does it flag and correct inventory accuracy exceptions?Accuracy

Check your data as well. An OMS cannot fix inconsistent item, location, or unit-of-measure data.

Where Everest Technologies comes in

Fixing inventory visibility challenges takes the right platform and the right implementation partner. Everest Technologies is an IT services provider specializing in retail and supply chain solutions, and our retail consulting team helps retailers close the gaps described above.

We begin with how your orders and inventory move today, from capture to fulfillment, and where delays, gaps, or manual steps hurt performance. From there, we help you build a connected system that brings inventory, orders, and fulfillment together, so your teams can make faster decisions.

For retailers who need real-time order routing and inventory orchestration across every channel, we implement and optimize Manhattan Active® Order Management (MAO). Our services include:

  • MAO design, configuration, and testing
  • Data conversion and integration with your POS, WMS, and ecommerce systems
  • Extension development for unique business requirements
  • Level 2 support to keep the system stable as your operations evolve
  • Everest is a Manhattan Platinum Partner
  • Twice named Partner of the Year in Manhattan's Value Partner program
  • More than 150 Manhattan Active® go-lives

Retail consulting

Make “in stock” a promise every channel can keep.

Whether you are implementing a new OMS or improving an existing one, we can help you build the speed, visibility, and control your channels need.

Talk to our retail consulting team
FAQ

Frequently asked questions

It is real-time knowledge of how much stock you have, where it is, what is incoming, and what is already committed to customers.

Inventory management is the wider practice of planning, buying, storing, and replenishing stock. Visibility is knowing the current state of that stock accurately enough to make decisions.

It consolidates inventory and order data from every channel and location, calculates available-to-promise stock, and shares it back to each channel as things change.

ATP is the stock you can still sell: sellable inventory, minus what is already committed to accepted orders, plus confirmed inbound stock where your policy allows.

It is a single view of stock across all regions, warehouses, and sales sites, with inventory segmented by market and channel so each storefront sells only from locations that can serve it.