This error (Error: Unable to Create Shipment: Notification no. 0 Severity: ERROR Code: 3601 Message: At least one freight shipment line item is required. Source: ship.) typically occurs when required order details are missing or set to zero when creating a FedEx shipment.
To resolve this issue, please check and update the order by following the steps below:
Click Orders then Overview.
Find the affected order.
Click Actions then Details.
Within the Details tab, check the following -
First Name/ Last Name: Ensure these are populated.
Order Value: Ensure this is greater than zero.
Weight: Ensure this is greater than zero.
Next, click the Items tab and check the following -
Price: Ensure each item on the order has a price set.
After checking and updating these, please click Save.
Click Orders then Overview.
Find the affected order.
Click Actions then Pick Order.
Generate the shipment.
If the error persists after making these changes, please raise a new case online and reference the title of this article. Be sure to include any relevant order details.