I have tried printing a DPD shipping label and am seeing an error returned:
consignment.parcel.parcelProduct.unitValue : Number should be between 0.01 and 9999999.99
The error is being returned because there is an item on the order with no value. This error should only appear for orders that are going through customs. If you see this error, then please make sure to go through all of the items on the order and edit the unit prices accordingly. The unit price values should be between 0.01 and 9999999.99.