I am trying to figure out why my SUM function won't work in a formula I am creating. I tried looking up the description of the SUM on the web (to no avail) and my help files are gone so I can't do a help look up. Can anyone tell me why I get the following error?

"Summary / running total field could not be created"

Below is the statement I am using...

numbervar shortcall;
shortcall := Sum({iApplicationStat.CallsAbandonedDelay}, {iApplicationStat.CallsAbandoned}) <= 10;