As DBlank is asking...
Are you meaning to suppress a group based on sum of the first 2 rows... I agree there is no functionality, subreport would work with the shared variable.
if you mean to suppress based on 2 columns in the same row, that is doable.
such as {table.field1} + {table.field2} = 0 would suppress
so it really comes down to, what does 'the first 2 data fields' mean.
unfortunately, as displayed krish's solution won't work as it is summing for the entire group, twice, so I doubt it would be zero...and it is not using the first 2 data fields