Fortnox warehouse module. How to avoid 0 orders.

In cases where users of the Fortnox system have the Inventory Module enabled, there's no capability to create an order or customer invoice through the Fortnox API with a Delivered Quantity greater than 0 for an item that has an inventory balance in Fortnox of 0 or less.

Regardless of what our integrations submit as the Delivered Quantity in these scenarios, Fortnox will set the Delivered Quantity for the specific item to 0, which in turn results in the item line total being 0. Unfortunately, there's nothing we can do on our end in these situations.

Possible solutions include one of the following options:

1. Deactivate the Fortnox Inventory Module - this allows for the creation of invoice lines with a Delivered Quantity greater than 0 even if the inventory balance for the item is 0 or less.
2. Ensure that the inventory balances for your items in Fortnox always exceed 0.
3. Allow Negative Inventory Balances in your Fortnox account, as per https://support.fortnox.se/produkthjalp/lager/aktivering-av-fortnox-lager#negativa-lagersaldon