I have tried printing a Parcelforce shipping label and am seeing an error returned: 

011048105: InternationalInfo/Parcels/Parcel[1]/ContentDetails/ContentDetail[1]/TariffCode MUST include either 8, 10, 12 or 14 numeric characters (i.e 0-9) for ServiceCode EPB or EPK or GBD. TariffCode MUST include either 6, 8, 10, 12 or 14 numeric characters


HS Tariff Code needs to be checked on order item [number] which is specified after ContentDetail in the error. It cannot be less than 6 characters and longer than 14 characters for Parcelforce.

Alternatively if you use Default Tariff codes in Parcelforce config or service config, they would also need to be checked and amended.

Related articles:

Shipping - HS Tariff Code and Country of Origin