Problem regarding the system fields....

Hi Abapers,

I have developed a report where in i have 10 columns..

now the requirement is that if the user click on the first columns and for the rest of columns it should not work

it should call some transaction

its is not an Alv...

Code is...

At line selection.

IF sy-colpos = 1.

call tranaction 'va01'.

endif.

but this is not working....