We have a problem with operational hours. We are working from 9:00 to 18:00 and we use this time for "Due by time" and SLA's. But we don't want to use it for worklogs as our technicians could work even at night and this time should be billable. We tried to add a Service plan with equal cost for working and non-working hours, but when we add worklog for ticket SDP still set only working time as billable. Am I doing something wrong?