System-Level Documentation: Order Entry Screen
System-Level Documentation: Order Entry Screen
Overview
The Order Entry Screen is a core component of the order management system, allowing users to create and manage customer orders efficiently. This screen captures critical details, such as order information, customer data, and product details, ensuring accurate order processing and fulfillment.
This document outlines the screen’s structure, individual fields, and the COBOL code required to display and support its functionality. It is tailored for developers, while remaining accessible to IT executives and decision-makers.
Screen Layout
Here’s the design as displayed in a typical 3270 terminal emulator:
---------------------------
Order ID : 98765
Customer ID : 54321
Order Date : 11/17/2024
Product Code : PROD123
Quantity : 10
Unit Price : $25.00
Total Price : $250.00
Shipping Date : 11/20/2024
---------------------------
Key Features:
- Dynamic Data Fields: Displays live data for customer orders retrieved from the database.
- User Inputs: Fields such as
QuantityandShipping Dateare editable, allowing users to customize orders. - Auto-Calculated Fields:
Total Priceis automatically computed based onQuantityandUnit Price.
Field Descriptions
Each field corresponds to a database column or a calculated value in the COBOL program. Here’s a breakdown:
High-Level Source Code
The COBOL program supporting this screen includes modules for data retrieval, display, input handling, and calculations.
1. Data Division
The WORKING-STORAGE section defines the fields displayed on the screen, mapping them to corresponding database columns.
05 ORDER-ID PIC 9(5).
05 CUSTOMER-ID PIC 9(5).
05 ORDER-DATE PIC X(10).
05 PRODUCT-CODE PIC A(10).
05 QUANTITY PIC 9(3).
05 UNIT-PRICE PIC 9(5)V99.
05 TOTAL-PRICE PIC 9(7)V99.
05 SHIPPING-DATE PIC X(10).
2. Display Logic
The PROCEDURE DIVISION contains code to retrieve and display existing order details. It also handles auto-calculation for the Total Price.
DISPLAY "---------------------------".
DISPLAY "Order ID : " ORDER-ID.
DISPLAY "Customer ID : " CUSTOMER-ID.
DISPLAY "Order Date : " ORDER-DATE.
DISPLAY "Product Code : " PRODUCT-CODE.
DISPLAY "Quantity : " QUANTITY.
DISPLAY "Unit Price : " UNIT-PRICE.
COMPUTE TOTAL-PRICE =
QUANTITY * UNIT-PRICE.
DISPLAY "Total Price : " TOTAL-PRICE.
DISPLAY "Shipping Date : " SHIPPING-DATE.
3. Validation
Input validation ensures only valid data is entered. For example:
Quantitymust be a positive integer.Shipping Datemust follow the formatMM/DD/YYYY.
QUANTITY NOT NUMERIC OR
QUANTITY <= 0
DISPLAY "Invalid Quantity".
END-IF.
4. Database Interaction
SQL or indexed file operations are used to retrieve and update order details:
SELECT
CUSTOMER_ID, :CUSTOMER-ID
ORDER_DATE, :ORDER-DATE,
PRODUCT_CODE, :PRODUCT-CODE,
UNIT_PRICE, :UNIT-PRICE,
SHIPPING_DATE :SHIPPING-DATE
FROM
ORDER_TABLE
WHERE
ORDER_ID = :ORDER-ID
END-EXEC.
Maintenance and Future Enhancements
This screen is well-structured and easy to maintain. Potential enhancements include:
- Adding support for discounts or promotions.
- Implementing a field for tracking shipment status.
- Integrating product stock level checks to warn users of low inventory during order creation.
Business Value
The Order Entry Screen is central to the organization’s order fulfillment process. Its user-friendly design and real-time calculations reduce manual errors and ensure accurate order creation. This tool empowers both customer service representatives and back-office teams to deliver consistent, reliable results.
Image: StockSnap from Pixabay
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