Fully Discounted Invoice and Tax Amount

When the standard invoice is fully discounted (100%), as per article 15 of VAT Implementing regulations, when the supply does not exceed 200 Riyals excluding VAT, it is considered as Nominaly supply. Please clarify when the supply exceeds 200 Riyals excluding VAT, will there be any validation on the VAT amount alone for the items while pushing the e-Invoice?

For example, when BT-106 is 4000 SAR, BT-129 is 1 and BT-108 is 4000 SAR for a line item in an XML, should the BT-110 be 600 Riyals or 0 Riyal assuming the Tax Rate to be 15%