If you are sending shipments internationally and have provided your HS or commodity codes for your products but you received the below error message from DPD/DPD Local:
DPD Local Validation error (1020) Invalid string value: consignment.parcel.parcelProduct.productHarmonisedCode
This means that the commodity code is not exactly 8 digits.
If you'd like to check if your commodity code is valid, you can go to the below site:
https://www.trade-tariff.service.gov.uk/sections
Need any assistance with your Shiptheory account, please contact support.