How to Add Traffic Sign in ALV report

REPORT ZTRAFFICSIGN.

TYPE-POOLS: slis. " SLIS contains all the ALV data types

*&---------------------------------------------------------------------*

*& Data Types

*&---------------------------------------------------------------------*

TYPES: BEGIN OF ty_sbook.

INCLUDE STRUCTURE sbook.

TYPES: icon TYPE c, " Add field to hold traffic light value

END OF ty_sbook.

*&---------------------------------------------------------------------*

*& Data Declaration

*&---------------------------------------------------------------------*

DATA: it_sbook TYPE TABLE OF ty_sbook.

DATA: wa_sbook TYPE ty_sbook.

DATA: it_fieldcat TYPE slis_t_fieldcat_alv,

wa_fieldcat TYPE slis_fieldcat_alv.

DATA: is_layout TYPE slis_layout_alv.

DATA: g_repid TYPE sy-repid.

*&---------------------------------------------------------------------*

*& START-OF-SELECTION

*&---------------------------------------------------------------------*

START-OF-SELECTION.

g_repid = sy-repid.

*Fetch data from the database

SELECT * UP TO 20 ROWS FROM sbook INTO TABLE it_sbook.

*Assign different traffic lights to each row based on condition

LOOP AT it_sbook INTO wa_sbook.

IF wa_sbook-luggweight LE 0.

wa_sbook-icon = 1. " Red Traffic Light

ELSEIF wa_sbook-luggweight LE 10.

wa_sbook-icon = 2. " Yellow Traffic Light

ELSE.

wa_sbook-icon = 3. " Green Traffic Light

ENDIF.

MODIFY it_sbook FROM wa_sbook TRANSPORTING icon.

CLEAR: wa_sbook.

ENDLOOP.

*Build field catalog

wa_fieldcat-fieldname = 'CARRID'. " Fieldname in the data table

wa_fieldcat-seltext_m = 'Airline'. " Column description in the output