I have tried printing a DPD shipping label and am seeing following error returned:
1007: Missing mandatory field (consignment.parcel.parcelProduct.productFabricContent)
This error is being returned because DPD requires a value for FabricContent Item Extended Property for the given order.
Typically the FabricContent property is not mandatory unless the service being used is DPD Direct. To resolve the error you will need to either change the service or add the mentioned property to your order items in Linnworks.net > Inventory > My Inventory > Product Details > Extended Properties screen.
Shipping - Adding Customs Data to DPD integration