pdf invoice show item line cost including the tax

[Blesta Addons]

in the PDF invoice doawnload, if the service line has TAX, the cost shown in the PDF with TAX .

Description           Quantity                 Unit Price                Cost

xxxxxxx                       1                            10                        12

the cost is showing the total (qnt X Unit) + %tax (20% in our case) . it should show the total without the tax included . affected version 3 and 4 .