I have tried printing a Parcelforce shipping label and am seeing an error returned:
011048105: InternationalInfo/Parcels/Parcel/ContentDetails/ContentDetail/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.