Sum for group in memory
I need some help, I have a tabular datawindow and it´s a data entry, it has a money field and I have to group for 3 fields and sum the money field,
the problem is the data is not in database for doing a sum group by, by the way if the sum is less than 0 for any grouping I can´t save the data. Can I sum in memory or something like that.
I will appreciate any help