SUM FORMULA FOR ALPHANUMERIC FIELD

[shaleen7]

I'm trying to write a formula that will sum all by application numbers in a group.
I wrote this formula:
SUM(COUNT({TABLEAPPLICATION.APPNO}))
...but I get this error message, "This field cannot be summarized".

The appno field is made of letters and numbers. For example: IK8963 or IK3000

What am I doing wrong?
Thanks.

 

[lbass]

Please see my post in your other thread.

-LB