VAT 100 Online Submission Failed: The value 'GB ########"' is invalid according to its datatype 'String' - The Pattern constraint failed

This is likely to happen if NetSuite users utilize the Online Submission for the first time. This error is caused by the values they entered in the VAT Registration No field in the Tax Filing Setup.

To rectify this:

1. Navigate to Reports > VAT > Tax Report (International).
2. Click the Setup button > Tax Filing.
3. VAT Registration No > Ensure that only numeric values are entered in this field. If users entered GB 123456789, remove GB.
4. VAT Post Code > No embedded spaces.
5. Hit Save.