Zero Value for invoices on Tax Box Return Preparation Report for specifc Tax Rate

A customer I support has many Tax Rates set up.

Comparing 2 of them:

• GB STANDARD
  • Tax Regime Code: GB VAT REGIME
  • Configuration Owner: Global configuration owner
  • Tax: GB VAT
  • Tax Status Code: GB RECOVERABLE STATUS
  • Tax Rate Code: GB STANDARD
  • Tax Accounts - populated fields:
    • Tax Expense
    • Tax Liability Account
    • Tax Recoverable Account
• GB AUTHENTICATED VAT
  • Tax Regime Code: GB VAT REGIME
  • Configuration Owner: Global configuration owner
  • Tax: GB VAT
  • Tax Status Code: GB RECOVERABLE STATUS
  • Tax Rate Code: GB STANDARD
  • Tax Accounts - populated fields:
    • Interim Tax
    • Tax Recoverable Account
    • Tax Liability Account

The main difference between the 2 above is that the Authenticated VAT has the Interim Tax account populated, and the Tax Expense field is empty.