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# Tracking lot or serial number products with FBA orders
When selling products that require lot or serial number tracking through Fulfilled by Amazon (FBA), Amazon does not provide tracking details via its API. This limitation can cause synchronization issues in Odoo.
When working with products tracked by lots or serial numbers, Amazon’s API does not send the specific tracking information for each sale. As a result, Odoo cannot assign the required tracking numbers, which leads to synchronization errors.
To avoid this issue, configure a **product kit** in Odoo that represents the Amazon product. When an FBA order is imported, Odoo processes the kit instead of the tracked product, preventing sync failures.
When **replenishing Amazon stock**, transfer the tracked product to the `WH/Amazon` location. This ensures proper inventory tracking and records stock movement at the time of transfer rather than at the time of sale.
**Note**
The `WH/Amazon` location is automatically created when the first Amazon account is connected.
With this approach, kit product quantities may remain negative. This is expected behavior, as actual inventory is managed through transfers to the Amazon location.
**Important**
This method does not track the exact lot or serial number used in each sale. Its purpose is to allow order synchronization without errors.
## **Settings**
To implement this workflow, ensure the following apps are installed:
- **Sales app**: Required to **connect an Amazon account**
- **Inventory app**: Needed for managing stock across **warehouse locations**
- **Manufacturing app**: Used to create **Bills of Materials (BoM)** for kits
## **Create a product kit**
To handle tracked products correctly, create a kit that represents the Amazon listing.
1. Go to **Sales app ‣ Products ‣ Products**
2. Click **New**
3. Create a product configured as a **kit**
**Important**
Do **not** enable **Track Inventory** for the kit product.
### **Link the Amazon SKU to the product kit**
Next, map the Amazon product to the kit:
1. Go to **Sales app ‣ Configuration ‣ Offers**
2. Click **New**
3. Select the **Amazon marketplace**
4. Choose the kit product
5. Enter the Amazon SKU
**Note**
This step intentionally removes the direct link between the SKU and the tracked product.\
Since Odoo cannot assign lot/serial numbers during sync, keeping that link would cause repeated failures.
By linking the SKU to the kit instead, the system bypasses the tracking requirement and completes synchronization successfully.
### **Create the BoM for the product kit**
Now define the kit structure:
1. Go to **Sales app ‣ Products ‣ Products**
2. Open the kit product
3. Click the **Bill of Materials** smart button
4. Create a **kit BoM**
In the **Components** tab:
- Add the original tracked product (lot/serial tracked)
**Important**
The tracked product must be the **only component** in the BoM.
Once configured, Odoo will process Amazon FBA orders using the kit, allowing smooth synchronization while maintaining internal stock tracking through warehouse transfers.