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[Aishwarya Rajan]

I need to copy custom field i.e (checkbox here) value of epic to child story checkbox field (custom field again).

I tried doing this 

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.issue.ModifiedValue

def field = ComponentAccessor.getCustomFieldManager().getCustomFieldObject('customfield_10434')

Issue currentIssue = getIssueContext() as Issue

def parentFieldValue = currentIssue.parentObject.getCustomFieldValue(field)

def changeHolder = new DefaultIssueChangeHolder();

def currentIssueStatus = currentIssue.getStatus().getName()

if(currentIssueStatus=="Open"){
field.updateValue(null, currentIssue, new ModifiedValue(currentIssue.getCustomFieldValue(field), parentFieldValue),changeHolder);
}

but seems its not working..any leads are appreciated.