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ALV reports are very useful to create lists and to provide standard functionality like sums, order and so on. To do this without ALV you would have to code all of this functions on your own.

There are several examples in the SAP system to see all these functionalities; they all start with BCALV_TEST_*.

To make sure that all works fine, the ALV FM or class must be called with the appropriate parameters. To make sure you are doing this OK, you can use this trick: for ALV reports created by the FM's REUSE_ALV_LIST*, insert the value &SOS in the command line and press enter. For ALV objects or FM REUSE_ALV_GRID* double right-click on an empty place of the ALV container while pressing the SHIFT key. You will get a full report of many parameters regarding the ALV.

ref: http://www.abap-code.com