# Amazon V2 partial updates

Partial updates tell Amazon to update only the mapped, non-empty fields that Channable sends for an item.

They affect how Amazon processes and validates the update. They do not decide which fields Channable sends.

### At a glance

* **Partial update:** used when Amazon finds an existing listing for the item
* **Full update:** used when no existing listing is found
* **Listing requirement level:** decides which data Channable sends

### When Channable uses a partial update

Channable uses a partial update when the item matches an existing listing in Amazon.

If no existing listing is found, 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 in that run.

If you leave a field empty, or do not map an attribute, Amazon keeps the current value.

A partial update can change both offer data and product data.

Partial updates matter because they:

* Preserve existing Amazon data for unmapped attributes
* Trigger less validation than full updates
* Still allow Channable to update mapped product and offer data

### What determines which data Channable updates

The **Listing requirement level** determines what data Channable sends.

It doesn't affect whether Channable uses a partial or full update.

Partial and full updates only change how Amazon processes and validates the data Channable sends.

The **Listing requirement level** determines:

* Which attributes you see in Channable when setting up your channel
* Which validation Amazon uses during a full update

### Example

Assume your item matches an existing Amazon listing.

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`

This is why a partial update can update some fields without overwriting others.

### 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.
   1. If the result is anything other than **No match found**, Amazon found a listing for that item. Channable will use a partial update for that item in the next run.
   2. If the result is **No match found**, Channable will use a full update in the next run.

### Related pages

* [How to set up an Amazon channel](/list-advertise/amazon/list-items-on-amazon/how-to-set-up-an-amazon-channel.md)
* [How to identify required attributes for your Amazon channel](/list-advertise/amazon/list-items-on-amazon/how-to-identify-required-attributes-for-your-amazon-channel.md)


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