Reports are a major part of application development used to display data to users. There are three main types of reports:

Classical Reports

• Simplest and most basic report type.
• Output is in line-by-line format using WRITE statements.
• Limited formatting, but supports interactive features like AT LINE-SELECTION.

Used for: Simple lists, master data overviews, basic reporting.

Interactive Reports

• Extension of classical reports.
• Allows drill-down capability: click on a row to see detailed data (secondary list).
• Can have up to 20 secondary lists.

Used for: Master-detail views, like viewing sales orders from a list of customers.

 Key event: AT LINE-SELECTION

ALV Reports (ABAP List Viewer)

• Provides a powerful, flexible, and interactive table display.
• Includes sorting, filtering, exporting, column formatting, etc.
• Can be simple ALV, ALV Grid, or ALV with OO (Object-Oriented) approach.

Used for: Complex and user-friendly reporting.

Main function modules/classes:

• REUSE_ALV_GRID_DISPLAY
• CL_GUI_ALV_GRID
• CL_SALV_TABLE (for OO ALV)