Two ways to list an offer — and where stock is deducted from

There are two ways to build an offer in Easyitem. They differ not in appearance but in where the stock figure comes from — and that is the most important decision you make when starting with OmniChannel.

Path 1 — the offer is built from your own data

PIM + WMS → OmniChannel → Allegro, PrestaShop, Shopify and your other channels

The offer is assembled from product data in PIM and stock from WMS. OmniChannel publishes it across every channel you choose.

Where stock is deducted: when something sells, the order lands in OMS and stock is deducted on the OMS or WMS side. Only then does the new figure travel to OmniChannel and out to the platforms.

When to choose it: when your warehouse is the truth about the goods. This is the natural route if you run WMS or keep stock in Easyitem.

Path 2 — a source account and replicas

PIM + WMS → OmniChannel → Allegro as the source account, then Allegro (source) → OmniChannel → replicas: a second Allegro account, PrestaShop, Amazon, eBay and more.

Here one sales account acts as the source offer and the others receive replicas that follow it. The role is shown on the offer list in the role / channel / account column.

Where stock is deducted: a stock change on the source account goes straight to OmniChannel and on to the replicas — bypassing WMS and OMS. The "Events" trigger group serves exactly this: Source offer stock changed, Source offer price changed, Source offer ended, Offer bid on, Offer purchased.

When to choose it: when your main sales account is the truth about the goods and the other channels only have to keep up with it. You do not have to put the warehouse in the middle of the process.

How the source account works in detail

The source account is the truth and the reference point for the replicas — it holds the current stock, and the replicas stay in line with it.

Changes on the source travel to the replicas:

• stock added on the source → added on the replicas, based on the source value;
• close the source offer → the replicas are closed in the same way.

Sales work the other way round: if goods sell on a replica, the change goes back to the source offer — that is where stock is reduced. Only then does the new figure spread to the remaining replicas.

That way every channel sees the same stock, whichever one the sale happened in. The source stays the single place holding the truth.

The practical conclusion: you make changes on the source offer, while a sale can happen in any channel — the system brings the stock back into line by itself.

What to keep in mind

• In path 2 the WMS stock takes no part in replication. If you run the warehouse in parallel, it can drift from what the source account shows — decide which of the two is the truth and stick to it.
• The "last item" rule looks different in each path. In the first you react to a sale in OMS or a stock change in WMS. In the second — to Offer purchased or Source offer stock changed.
• Both paths can run side by side for different product groups. All the more reason to write down which group travels which route.