Schedule Line is a piece of information about the time period a scheduled activity or event is supposed to be delivered to the customer. It is created against a respective schedule agreement that contains customer-defined delivery quantities and dates. Schedule lines make a representation of schedule agreements in the delivery schedule.
Schedule lines are used within a delivery schedule when there is a need to spread required delivery qualities over different dates or a period of time. In such a case the delivery schedule includes schedule agreements that consist of lines indicating individual quantities per delivery date. For every schedule agreement there can be multiple schedule lines, depending on how many dates the total delivery period has been divided into.
If a customer agrees with a supplier on using schedule lines in the delivery schedule, then all the lines of this schedule are supposed to be discussed and established before the delivery begins and are not changeable during the delivery. The advantage of using schedule lines is that the customer can fix delivery dates at the very beginning of the deal, while the supplier can plan for the delivery beforehand.