Hi
You want 1 to be displayed always for all details ?
like :
1
1
1
1
1..
or you want a serial number :
1
2
3
4
5
6..
If you want only 1 to be displayed then.. say
If not(isnull(fileld}) then 1 else 0 // make sure the field is not null
To get serial number you will have to write a manual running total and this formula can be used in other formulas but can't be summarised.