VAT NPR: not calculated into VAT REPORT

Hi,
I’m using for some customers SPLIT PAYMENT where VAT are paid to Treasury directly from my customer so they not pay VAT to me.
I have created a new vat tax with option NPR and all is ok on invoice view.
Problem is on VAT report: report is generated as if I receive VAT and so total amount of VAT is wrong.
I attach some screen for more clarity.
Any ideas?
Thanks a lot
Marco