VAT only supplier invoices

Hi - I want to post VAT only supplier invoices.  How do I do this?  I work for a company in the UK and we receive them for things like insurance claims for repairs on cars where the VAT is not covered by the insurance.  The invoice will be posted using an invoice register journal or an invoice journal.  I cannot do it as the VAT / net amount keeps recalculating.  Thanks.

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