I observed that the preview of invoice where "add tax to amount" is selected is not the same as the actual invoice. The actual invoice does not add the tax amount to the total amount on individual line.

Also, the Total invoice value should be the sub-total plus VAT, while the amount due should be total invoice value less TDS. when TDS is selected when invoicing, it shows total invoice value as amount due, this is wrong presentation as it usually confuses customers. customers should be able to see the total invoice amount before the advice for TDS.