Multichannel inventory sync: planning before you connect

The master system

Stock must live in one place — usually the accounting or warehouse system, such as 1C. Physical store sales, online orders, marketplace orders, deliveries from suppliers, returns and write-offs all update it. Every channel reads from it. If any channel keeps its own stock that staff update by hand, errors are certain. See 1C integration.

Reservations

When an order is placed in any channel, stock should be reserved immediately in the master system. Otherwise, the same item can be sold twice during the time between order and shipment. Cancelled or unpaid orders release the reservation after a set time.

Update frequency

• Real-time or near real-time updates for fast-moving products, where channel APIs allow.
• Scheduled updates (every few minutes or hours) where they do not.
• Event-based updates when stock changes significantly — for example, an item reaching zero.

Each marketplace and platform has its own update mechanisms and limits. Check them before promising customers real-time accuracy.

Buffers

For channels with slower updates or very high demand, show less stock than is available — for example, keep a small safety buffer per product, or stop selling on a marketplace when stock falls below a threshold. Buffers reduce overselling at the cost of occasionally missing a sale.

Multiple warehouses and stores

If stock sits in several locations, decide which locations serve which channels. A website might show stock from all stores for click-and-collect but only from the warehouse for delivery. The logic must be explicit in the system.

Bundles and variants

• Products sold as sets reduce stock of each component.
• Variants — sizes, colours — have their own stock.
• Products with the same SKU across channels simplify sync; mapping tables handle channels that use different identifiers.

Returns and damaged goods

Returned items should return to available stock only after inspection. Damaged goods should not be available for sale. The process must update the master system consistently.

Monitoring

• Alerts when a sync fails or is delayed.
• Alerts for anomalies: a whole category dropping to zero, sudden large changes.
• Regular reports comparing stock across channels.
• Tracking oversells: orders cancelled because items were not available.

Stock accuracy comes first

Sync spreads whatever is in the master system. If physical stock and recorded stock differ, sync spreads the error. Regular stock counts, disciplined recording of movements and clear processes for returns and write-offs are prerequisites. See inventory sync.