Hi Elakkiya.
If you don't want to change the column type , you need to change some fields of the column when the catalog is generated.
I used the next lines to show 2 decimals instead 3( field type = BRGEW ):
<w_fcat>-decimals_o = 2.
<w_fcat>-decimals = 2.
clear: <w_fcat>-domname,
<w_fcat>-qfieldname,
<w_fcat>-ref_table,
<w_fcat>-datatype.
Regards,
Manuel H.