Solution — Inventory
Inventory problems are experienced by customers as broken promises: an item that was in stock at checkout and cancelled a day later, a delivery estimate nobody could honor, a back-in-stock email for something still not back in stock.
Underneath, the cause is usually definitional. Nobody has decided precisely what "available" means — across locations, channels, pre-orders, allocations and in-flight transfers — so each system computes its own answer.
Symptoms
Support ticket volume is often the most honest inventory report a business has. When cancellations and "where is my order" tickets climb together, the problem is usually upstream of the storefront.
Signals
Availability is a business rule, not a number a system happens to hold.
Likely causes
No single definition of available-to-sell
On-hand, committed, allocated, in transit and safety stock are combined differently by each system that touches them.
Sync timing mismatched to velocity
An hourly sync is fine for slow SKUs and disastrous for the ones that sell out in twenty minutes.
Multi-location logic left implicit
Which locations are sellable, in what priority, and what happens when one runs dry.
Bundles, kits and pre-orders as exceptions
Handled manually because the model never accounted for them, then forgotten under load.
Fulfillment events not flowing back
Shipments, partial shipments and tracking that never reach the storefront or the customer.
Returns and restocks unmodeled
Physical stock returns to the shelf but availability doesn't, or does twice.
What we'd examine
The fastest diagnostic is to follow a single fast-moving product through every system that claims to know its quantity — receiving, ERP or inventory system, 3PL, storefront, marketplace — and record where the numbers diverge and why.
From there the fix is usually part definition, part integration, part merchandising: sell what you can deliver, and say so clearly on the page.
When the ERP is the other half of the problemThe audit
Proof
Wulf's Fish
Five years of extensive custom development for a business selling perishable product, where availability, cut-offs and fulfillment logic have to reflect operational reality rather than a generic commerce model.
ROAM Adventure Co.
Direct-to-consumer and wholesale demand drawing on the same physical inventory — the case where allocation rules stop being theoretical.
Tell us which SKUs cause the most cancellations. That's usually where the definition broke.
