ALV report

hi,

how to change the column heading name in ALV report.In my report it is displaying column heading as Table field name.I want to display as "Title01" ,"Title02" like that..

how can i do this?

where should i define the column heading names?

I am using following function modules for displaying report.

REUSE_ALV_FIELDCATALOG_MERGE &

REUSE_ALV_LIST_DISPLAY

thanks in advance,

yad.