reset value by group in crystal report - crystal-reports-xi

Question

hi i write a formula in crystal report the similar to running total because i cannot use the running total filed for further calculation.but now i am facing a problem that i cannot reset the values by group. i have applied the formula
numbervar Sump;
Sump := Sump+{#Variance};
and for resting purpose i added one more formula in the group header.
whileprintingrecords;
shared numbervar Sump := 0;
the reset is not working. please find the snapshot and advice me how to do it.
enter image description here

Answer 1

You have two errors in your formulas
You define the Sump variable as global in one formula and as shared in the other. Therefore the CR cannot match it. Additionaly, if you declare it global, its scope will apply for all the rows , not only for its group itself
You assign the zero value to your variable in the second formula. But consider that this formula is executed for every group, not only once so it will always display zero
Try to write your first formula like this
shared numbervar Sump;
Sump := Sump+{#Variance};
and the second like this
whileprintingrecords;
shared numbervar Sump;