We currently have an issue for stock reservation in Amazon integration, what happens is before creating the order we do a stock reservation, and for itens that are KITS we are have an issue in stock reservation, but when the Order is created the stock is being reserved with no error.

This will only be applied for KITS in Amazon Integration, and for stock reservation, inside the bridge - Orders menu. we can see a warning:

Order reservation failed: SLA not available

Once the order is created the stock is reservation with success.