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Problem with ALV Grid Top-of-Page - How to print more than 60 characters?
Author: Joyjit Ghosh, IBM India
Origital: http: //www.saptechnical.com/Tutorials/ALV/TopofPage/Solution.htm

Problem:
Normally in ALV grid TOP_OF_PAGE, we cannot display information of more than 60 characters long. This is due to the limitation of the FM REUSE_ALV_COMMENTARY_WRITE. Usually we call this FM from the subroutine that is linked with TOP_OF_PAGE event.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
EXPORTING
it_list_commentary =
i_logo =
i_end_of_list_grid =
.
*"---------------------------------------------------------------
*"*"Lokale Schnittstelle:
*" IMPORTING
*" VALUE(IT_LIST_COMMENTARY) TYPE SLIS_T_LISTHEADER
*" REFERENCE(I_LOGO) OPTIONAL
*" REFERENCE(I_END_OF_LIST_GRID) OPTIONAL
*"--------------------------------------------------------------

In this above FM, exporting parameter ‘IT_LIST_COMMENTARY’ contains a field ‘INFO’ that is only 60 characters long. And it is responsible for displaying the information in the TOP_OF_PAGE area.

Solution:
To overcome this limitation we can use dynamic document, which can be implemented through the class CL_DD_DOCUMENT. As dynamic documents use HTML viewer control so instead of triggering the TOP_OF_PAGE event we should trigger event of HTML TOP_OF_PAGE.

First create a subroutine for top of page in HTML format and send that name in I_CALLBACK_HTML_TOP_OF_PAGE parameter of ALV function module. The input parameter for this subroutine will be a variable of class CL_DD_DOCUMENT.