# Smart Billing: Real-Time Profit Control in Sales Billing
**YouTube:** [Negative Margin Alert in Billing](https://www.youtube.com/watch?v=iXZFVeE-7dw\&list=PLTq0qszGb3BMeZnSJqRD1GVc2EpcogpJM\&index=113)
## Negative Margin Alert in Billing
This tutorial explains how to **monitor and control profit margins in the Sales Bill Touch Screen Window** in Logic ERP. It highlights how the system alerts users when margins turn negative and how to configure margin visibility and calculation settings for better profitability control.
***
### **Objective of This Feature**
* Detect **negative margins instantly**
* Prevent **loss-making transactions**
* Improve **pricing accuracy and profitability control**
* Enable real-time **decision-making during billing**
***
### **Understanding Margin Alerts in Sales Billing**
* While entering items in **Sales Bill Touch Screen Window**
* **Example:** Discount entered as **40% instead of 4%**
* Margin becomes **negative**
* Entire line item is displayed in **Red Color**
**Meaning**
* Transaction is resulting in a **loss**
**Correction**
* Adjust discount to correct value (e.g., **4%**)
**Result**
* Margin becomes **positive**
* Red highlight disappears
***
### **Displaying Margin Column**
* Go to **Column Attributes** in Sales Bill Window
* Tick: **Margin (%)**
***
### **Configuring Margin Calculation**
* Open **Sales Voucher Configuration Window**
* Select the relevant **Sales Bill Series**
* Navigate to: **Other Settings 1→ Other Settings (Defaults)**
* Define:
* **Bill-wise Profit Calculation Method**
* Purchase Value
* Sale Value
* Ensure option is enabled: **“Display Profitability in Bill”.**
***
### **Key Benefits**
* Prevents **unintentional losses**
* Provides **real-time margin visibility**
* Enhances **pricing control**
* Supports **better decision-making during sales**
***
### **Best Practice Tips**
* Always keep **margin column visible**
* Double-check discounts before saving bills
* Configure profit calculation as per business needs
***
### **Final Outcome**
* Negative margins are **instantly detected and highlighted**
* Users can take **corrective action immediately**
* Sales transactions become **profitable and controlled**
* Overall billing process becomes **more accurate and efficient**
***
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