Why do inventory discrepancies occur between systems?

Because each system (webshop, marketplace, ERP, WMS, fulfilment) maintains its own inventory. Without automatic synchronization, those counts diverge due to sales on multiple channels, manual updates, and adjustments that don't flow through everywhere.

Which system should be the master of my inventory?

That varies by organization. Often it is your ERP or your WMS/fulfilment. It is important that you choose one leading system and that all other channels adapt to it — so that there is one source of truth.

Does the inventory sync work automatically or with batches?

With KoneX, inventory adjustments are processed automatically between your systems, without manual work. Where it is more efficient (for example, with large volumes), KoneX also supports batch processing.

Can I synchronize inventory across multiple sales channels at once?

Yes. Within one Connected Commerce landscape, KoneX synchronizes your inventory between your webshop, multiple marketplaces, ERP, and fulfilment simultaneously, so every channel works with the same real-time stock level.

Does automatic synchronization completely prevent overselling?

Automatic synchronization greatly reduces the chance of overselling because all channels show the same real-time stock level. With very high, simultaneous sales across multiple channels, a small margin may remain; for this, you can work with safety stock or buffers. To be honest: no solution guarantees 100%, but a good sync makes a huge difference.

What does it cost to automate my inventory sync?

That depends on the number of channels, systems, and data flows. View the available licenses and pricing plans or schedule a call for a custom proposal.

Preventing Inventory Discrepancies: One Up-to-Date Inventory

Short answer: inventory discrepancies occur because your systems are not working with the same stock data. You prevent them by maintaining one real-time stock level that automatically synchronizes between your webshop, marketplaces, ERP, and fulfilment — so every sales channel always sees the same, correct number.

As long as you sell on one channel from one system, things usually go well. As soon as you sell via a webshop and one or more marketplaces, and manage your inventory in an ERP or WMS, it becomes more difficult: each system thinks it knows its own stock level. Without automatic synchronization, those numbers diverge — with unpleasant consequences.

Why do inventory discrepancies occur?

Multiple sales channels – a sale in one place is not immediately processed in the other.
Manual updates – inventory updated by hand or via CSV is by definition late and prone to error.
Different “truths” – webshop, ERP, WMS, and fulfilment each keep their own count, without a single source of truth.
Returns and adjustments – receipts, corrections, and transfers that don’t flow through everywhere.

What do inventory discrepancies cost you?

Problem	Consequence
Overselling	Cancellations, refunds, and dissatisfied customers
Stockouts (shown too low)	Missed revenue on products that are actually in stock
Manual checks	Hours of work spent counting and correcting
Incorrect purchasing	Ordering too much or too little
Bad reviews	Lower ranking on marketplaces

How to prevent discrepancies: one real-time stock level

The solution is not “counting harder,” but one source of truth for your inventory that automatically synchronizes with all your channels. Specifically:

Choose your master – determine which system holds the leading inventory (usually your ERP or your WMS/fulfilment).
Synchronize automatically – let every sale, receipt, and correction automatically flow through to all channels.
Work without manual entry – this ensures inventory is always up-to-date and reliable, even during growth.

Event	What happens automatically
Sale on the webshop	Stock decreases on all marketplaces
Sale on Amazon or Bol	Stock decreases on the webshop and other channels
Receipt in the warehouse	Stock increases everywhere simultaneously
Correction in ERP/WMS	All channels show the new quantity

The options at a glance

Approach	Inventory sync	Point of attention
Manual (CSV)	Too late, prone to error	Only for very low volumes
Per-channel apps	Often separate per channel	No central source of truth
Custom API	Customization possible	Development + maintenance
Integration platform	Central, across all channels	Set up once, grows with you

How does KoneX do it?

KoneX synchronizes inventory automatically between your webshop, marketplaces (such as Amazon and Bol), your ERP, and your fulfilment within one Connected Commerce landscape. As soon as a sale or receipt occurs anywhere, it is processed everywhere — adjustments happen automatically, and where it is more efficient (for example, with large volumes), KoneX also supports batch processing. This way, every channel works with the same, real-time stock level.

Do you first want to understand when individual connections suffice and when a platform fits better? Read also: Individual connections or an integration platform? or view all systems that KoneX connects.