Problem
You want to have a fields that contains the sum of all the story points under an Epic.
Solution
integer sum = 0;
if(issueType == "Epic") {
for(string i in selectIssues("parent = " + key)) {
if(i.storyPoints > 0) {
sum += i.storyPoints;
}
}
}
return sum;
Example output: 7
Make sure that the “Parent update” trigger is enabled in the scripted field configuration to ensure that the scripted field on the Epic gets updated when a Story (or other child issue type) is updated.