Line discount on purchase document

AttiaDynamicsLink

scenario: purchase line with 200 pcs, price not including vat is 20, so total line exlc. VAT is 4000, VAT 13% which is 520, then total amount incl. VAT is 4520.. now try to give line discount, the VAT amount will change?!!! i need to give line discount and keep the vat to be calculated based on the amount before discount, so i need VAT to be all the time 520 regardless of Discounts. any help or ideas?

amitkadam8

in structure there is on option include line discount. Uncheck this feild..