How to give Discount to a POS Bill in ADempiere Retail

POS Bill Discount (accessed with the shortcut ALT + D on the billing screen) lets the cashier apply a bill-level discount to the entire invoice—rather than to individual items. It’s typically used for customer goodwill, special campaigns, or manager-approved concessions.

User Access

Who can access

Cashier

What User can do

Open discount window (usually using ALT+D or a dedicated button)
Select discount type:
- Flat Amount (e.g., ₹100 off)
- Percentage (e.g., 10% off the total)
Enter the discount value
Select or enter a discount reason (optional or mandatory as per policy)
Apply and save the bill

Pre-Requisite Activities

Define user access rights for discount permission
Configure maximum discount limits per role (Cashier, Manager, Supervisor)
Maintain master list of discount reasons
Enable discount option in POS settings
Make sure tax and rounding rules are configured properly

Business Rules

Only authorized users can apply discounts
Discounts should not exceed defined limits unless overridden by higher role
Reason code must be selected before applying discount (if required)
Tax must be recalculated on the discounted amount
Full audit log should capture bill number, discount value, reason, user ID, and timestamp
Items marked as Non-discountable are excluded (if configured)
In case of return, discount should be proportionally reversed