ABAP/4 stands for Advanced Business Application Programming is the programming language used for the thousand of tiny embedded programs called transactions that make up the SAP application. 

ABAP programs are objects of the R/3 Repository. Like all other Repository objects, you maintain them using an ABAP Workbench tool - in this case, the ABAP Editor (tcode SE38). 

Time to self-test your knowledge by answering this question in the ABAP Forum:
Payment Against Invoice in Smartforms

ABAP Menu:
Abap/4 Query
Functions / SAP Script / ALV
Smartforms
Database Table

Table of Contents

• ABAP/4 Editor - Introduction
• ABAP/4 Development Code Efficiency Guidelines
• Debugging Program with ABAP Debugger
• ABAP program calling another ABAP program
• ABAP Program run in background
• ABAP Text String Finder in program source code
• ABAP Report Page Number
• Comparing two ABAP Program
• ABAP Program Authorization
• What is the use of Authorization Checks
• Difference Between Modify and Update Statement
• What Are Classical Reports
• New Project and Component

• Dynamic structure
• Download Structure from SAP to MS-ACCESS
• Domain and Data Element
• Data Field
• ABAP Dictionary Short Questions with Answers

• Prevent user from submitting the same jobname ZXXX twice
• Force user to run program in Background

• Message-ID
• Difference Between Field Symbol and Field Group
• SAP User Exits Routine
• Field Exits
• How to Find Screen Exit in a Given SAP Standard T-code
• Difference Between User, Customer, Screen Exits and Field Exits
• How User Exits Can Be Used
• What is User Exits and Field Exits
• How To Program the F4 Help
• Multiple Ways of Searching for BADI
• User Exit for MIRO Tr.code in SAP QM
• Find a Particular User Exit
• Different Types of User Exits
• Different Kinds of Messages
• System Messages

• Executing Unix command from ABAP

• Different method of Converting Date in ABAP
• OY05 - Maintain the Factory Calendar
• To find out the Previous Saturday for a given date
• How to add hours, minutes and seconds
• System Date Format to DD-MON-YYYY
• System Fields for Date and Time

• BDC FAQ
• Handling Table Control in BDC
• General Flow of a BDC Program
• Batch Input Program for Transaction VA01
• Example BDC Program Of BOM In Retail
• Program To Download Batch Session Log Into Excel

• Lock/Unlock the ABAP Editor Lock Field
• Hiding ABAP Source code
• Copy the current Client password to the rest of the Client

• Purpose of ok_code in Dialog Program
• Table Control In Dialog Program
• Screen Group Questions
• Dialog Programs

• Use Hashed Tables to Improve Performance
• Performance Tuning In Programming ABAP
• Performance Analysis of an ABAP Object

• SAP Abap FAQ - Frequently Asked Questions
• ABAP Interview Questions
• Interview Questions Answers For Abaper
• Answers For These ABAP Questions
• True or False ABAP Questions
• Answers To These Important ABAP Questions
• The Different Types Of ABAP Reports
• Brain Dump ABAP Questions and Answers
• LPOS (List Position) and SPOS (Screen Position)
• Types Of Views
• Different Types of ABAP Programs

• Useful SAP Tables

SAP ABAP Certification Review: SAP ABAP
Interview Questions, Answers, and Explanations

Differences

• Difference between Select-Options and Parameters
• Difference between select single and up to 1 row
• Difference Between RFC and BAPI
• Primary and Foreign Key Relationship
• Differences Between Search Helps and Match Code

ABAP Projects Management

• Client Strategy for Management of ABAP Projects
• Tasks That Would Take Place in a Development Project

Transport
Release Your Transports

Reports
Interactive Reports

Numbers

• Convert minus sign to the left
• Remove The Leading Zero's

• Search data in Select-Options
• When START-OF-SELECTION is Not Required
• Putting The Tabs in Selection-Screen

• Check Boxes in an Interactive Report
• Check Valid line selected before Drill Down
• Write - To Bold or not to bold for laser printer
• Left Column Scroll Lock just like Excel
• End of page Routine
• Copy Program Variants from one to another
• Creation and download an XML file
• Write SAP ICONS on your reports
• Extract the Producton Order System Status
• Download components of Production Order
• Purchase Order Condition Records
• Meaning of CHANGING < Var> in subroutine call
• How to read same field from D.Base into two fields of ITAB
• How to add two internal tables in third internal table
• How can we run abap program from command line
• How to identify existing transaction to an ABAP
• An Example of a ListBox Program
• Dynamically Assign Field Content
• Coding Logic to Print Stars
• Simple Abap Program Example
• Print The Characters in Reverse Order

• Optimization of Codes
• OK Codes

• Find Maximum Value or Is Empty Internal Table
• With Header & Without Header Internal Table
• Difference Between Internal Table and Work Area
• The Events in Table Maintainance Generator SM30
• Ways To Create Internal Table
• Open Dataset in ABAP
• Different Types Of Internal Tables And Their Usage
• Separate File in Sequential Order
• Internal-tables

• ABAP Workbench And Test Tcodes

ABAP Issues/Problems
ABAP Discussion Forum

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips