QB Issue Resolution:

Under the Amount are field select No VAT from drop-down arrow menu, and enter the Total amount (Gross amount) under the amount column.

Resolution for Issue 'How do I enter an expense without having to enter the VAT code? We are not VAT registered.' available: Yes (Solved).
Source: Intuit Community forum.

How do I enter an expense without having to enter the VAT code? We are not VAT registered.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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