When trying to submit the EC Sales List VAT return, the following error can occur:
Please see the link for VIES VAT number validation that allows for the VAT registration number to be checked to confirm whether or not it is a valid entry.
If the VAT registration number is invalid then this will be the reason for the failure message provided by HMRC. You will need to check with your client to see if the number has been quoted properly. Please check that it has:
If the number continues to be invalid the business will need to contact their tax administrators to request that the data in VIES (VAT Information Exchange System) be updated. If you find that your business's data is incorrect or not up to date then you will need to contact your own tax administrator and ask for it to be corrected.