SAP ABAP Problems & Solution

In SAP there are multiple types of report.We can mark them like: Classical report, Interactive report, ALV report. Classical Report: Which contains both selection-screen and output screen. Event based program, written in ABAP language. Executed based on events not line by line. Interactive Report: Display basic information on the basic list and the detail information in the  secondary list. In SAP there are 21 list, first one is called basic list with list number 0 and others are known as secondary list and start with 1,2,3 to 20. System variable SY-LSIND  give the list index number. ALV Report: Looks better  ALV report gives extra benefit like sort, Filter, sum, changing layout, downloading in different format & print.