How do I use discount on discount for item in sale transaction?
First you need to enable Setting of discount
1.Goto Setup > Configuration > Innoventry Setting
2.Scroll down the right side bar at end of page their is option related to discount
Enable Discount on Discount in percentage: If you want to give percent(%) discount.
Enable Discount on Discount as Fixed amount: if you want to give fixed amount(Rs) as discount.