Can I create VAT only invoices to match previously issued invoices that have been sent to a client without VAT

Hi @sylwia-judycka 

I assume you have either made a mistake or have just been issued with a VAT number.

You can...

   Line (1)  Amount(+)   20% VAT

   Line (2)  Amount(-)   0% VAT

but, I think the preferred way would be to cancel/credit the original invoices & issue correct invoices.  This way everyone's accounts are neat.

Hope this helps.