# Partial updates for Amazon channels Partial update means that we tell Amazon to only update the fields that are explicitly mapped in Channable and not empty. They control how Amazon processes and validates an item update. ### At a glance


Partial updates	Full updates	Channel type (Listing requirement level)
Used when there’s an item both in Channable and in the connected Amazon seller account. (Identified through the Unique ID provided in the Settings step)	Used when we can’t find a matching SKU in Seller Central for an item. Note: This is why it’s important to ensure the SKUs in Amazon match those in Channable - otherwise, you could create duplicate listings.	Decides whether you want to update offer data, product data, or both for a given item.

Partial updates

Full updates

Channel type
(Listing requirement level)

Used when there’s an item both in Channable and in the connected Amazon seller account.

(Identified through the Unique ID provided in the Settings step)

Used when we can’t find a matching SKU in Seller Central for an item.

Note: This is why it’s important to ensure the SKUs in Amazon match those in Channable - otherwise, you could create duplicate listings.

Decides whether you want to update offer data, product data, or both for a given item.

### When Channable uses a partial update Channable uses a partial update when the item already matches a listing in your Amazon seller account. If no previous listing exists in your seller account,, a partial update is not possible. In that case, Channable uses a full update. ### What partial updates change With a partial update, empty or unmapped attributes are not updated during that run. That means if you send an empty field, or don't map an attribute, that information stays unchanged. {% hint style="info" %} **Note:** A partial update doesn’t mean only offer data can be updated. It can also change product data, like descriptions and titles. {% endhint %} > #### Example > > Assume your item matches an existing Amazon listing in your seller account.
> > If you run your channel with: > > * `price` with a new value, Amazon updates `price` > * `description` unmapped, Amazon keeps the current `description` > * `brand` empty in this run, Amazon keeps the current `brand` > * `sale_price` unmapped, Amazon keeps the current `sale_price` > > This is why a partial update can safely update some fields without overwriting others. **Partial updates matter because they:** * Preserve existing Amazon data for unmapped attributes * Reduce validation impact compared to full updates * Still allow Channable to update mapped product and offer data ### What determines which data Channable updates The listing requirement level you choose does **not** affect whether Channable uses a partial or full update. **The Listing requirement level determines:** * The attributes you see in Channable when setting up your channel * Which validation Amazon uses during a full update Partial or full updates only change how Amazon processes and validates that data. ### How to check whether Channable will use a partial update 1. In **\[your Amazon channel]**, go to the **Result** step. 2. In the **Channable | Your Amazon account** table, check the **Listing status** column. 3. If the result is anything other than **No match found**, we found the listing in your Amazon seller account based on your Unique ID. Channable will use a partial update for that item in the next run. 4. If the result is **No match found**, Channable will use a full update in the next run. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://helpcenter.channable.com/list-advertise/amazon/list-items-on-amazon/partial-updates-for-amazon-channels.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.