What Amazon multi-location inventory does
Amazon Multi-Location Inventory (MLI) lets a seller tell Amazon how much stock each of their own ship-from locations holds, instead of one total. Amazon calls these locations supply sources. With MLI, Amazon can show more accurate delivery dates to buyers, because it knows which location has the item.
SKULabs supports Amazon MLI for FBM (Fulfilled by Merchant) listings. You link each Amazon supply source to one or more SKULabs warehouses. Stock sync then sends Amazon a separate quantity for every supply source, based on the stock in the warehouses you linked to it.
FBM only. FBA listings are stocked by Amazon and are not affected.
Amazon US marketplace only, because Amazon offers MLI only there.
Stock only. Amazon orders do not say which supply source they ship from, so this feature does not assign Amazon orders to a warehouse. To choose the warehouse for each order, see Automated Order Geo Routing.
Before you start
Set up your supply sources in Amazon Seller Central. Create one supply source for each location you ship from and make sure Multi-Location Inventory is active on your account. SKULabs reads the supply sources from Amazon; you cannot create them in SKULabs.
Connect your Amazon store to SKULabs and turn on stock sync for it. See What is stock sync?
Create a SKULabs warehouse for each location whose stock you want to report, and keep its stock accurate.
How to link supply sources to warehouses
Go to Settings > Inventory > Stock Sync.
Click the edit (pencil) button on your Amazon store. The Stock Sync Settings window opens.
Under Linked Warehouses, SKULabs lists each Amazon supply source by its name in Seller Central. Under each supply source, check the SKULabs warehouses whose stock should count for it.
Save.
Run a listings sync for the Amazon store. This adds the supply sources to your FBM listings. Until it runs, stock sync keeps sending one total per SKU.
If SKULabs cannot reach Amazon's supply sources (for example, MLI is not active on your account or Amazon returns an error), the window shows a single All Amazon Locations list instead, and stock sync keeps sending one total. Supply sources you already linked are still listed by their ID.
How stock is calculated and sent
One quantity per supply source. For each FBM SKU, SKULabs adds up the stock in the warehouses linked to each supply source and applies the store's stock rule.
All locations in one update. Amazon requires every supply source for a SKU in the same update, so SKULabs always sends them together.
The default channel is set to 0. For MLI SKUs Amazon requires the general (DEFAULT) quantity to be 0, so the sellable stock comes only from your supply sources. SKULabs does this for you.
Errors apply to the whole SKU. If Amazon rejects the update for a SKU, Sync Reports show the error on every location of that SKU.
A warehouse can be linked to more than one supply source. Its stock then counts toward each of them, so link each warehouse once unless you mean to share its stock.
Stores without multi-location
If you leave the supply sources unlinked, nothing changes: SKULabs sends one total quantity per SKU, as before. MLI starts only when at least one supply source has a linked warehouse.
FAQs
Why do I only see "All Amazon Locations"?
SKULabs could not get supply sources from Amazon. Check that Multi-Location Inventory is active in Seller Central and that you have at least one supply source, then reopen the window. If the store's Amazon access expired, reauthorize the store first.
I linked my warehouses but Amazon still shows one total. Why?
Run a listings sync for the Amazon store. Stock sync sends per-location quantities only for listings that have the supply sources, and the listings sync adds them.
Does this change which warehouse ships my Amazon orders?
No. Amazon orders do not include a supply source. Use Geo Routing, shipping rules or the picking screen to choose the warehouse.
Does this work for FBA or other Amazon marketplaces?
No. Amazon supports MLI only for merchant-fulfilled (FBM) listings in the US marketplace.
Can I see what was sent for each location?
Yes. The stock sync entries in Sync Reports name the location for each quantity sent.