Jim and Larry,

You are right (well almost ever :) ), I have in the form two modes (one for New and other for Modify), in the New mode I'm doing SUM ... TO but in the Modify mode I'm doing a SELECT SQL !!! (Stupid of me.....)

I assume than CALCULATE SUM.. works like the SUM.. TO. Must I choose one of these? Is any better?

Thanks for your reply.. I was going mad with this.