Hey Krishna Try setting the attribute of tablecontrol-lines which indicates the total number of lines of table control to the total number of lines of internal table In PBO before the LOOP AT statement.
describe table ittable lines lv_line
tablecontrol-lines = lv_line.
as in this example.
http://help.sap.com/saphelp_nw04/helpdata/EN/9f/dbac5e35c111d1829f0000e829fbfe/content.htm
thanks.