import com.atlassian.jira.component.ComponentAccessor

final Long customFieldName1 = 11700L;//期望效果
final Long customFieldName2 = 11701L;//成功信心

def customField1 = ComponentAccessor.customFieldManager.getCustomFieldObject(customFieldName1);
def customField2 = ComponentAccessor.customFieldManager.getCustomFieldObject(customFieldName2);

def cfValue1 = issue.getCustomFieldValue(customField1) as double; #获得当前问题的期望效果的值
def cfValue2 = issue.getCustomFieldValue(customField2) as double; #获得当前问题的成功信心的值

cfValue1+cfValue2  #将成功信心和成功信心累加