Hi..
Basic start date
Use
Earliest date for the execution of the production order. This date takes into account the float before production.
If, on order creation, a planned order exists for the production order or process order, then the order dates are taken from the planned order. When scheduling the production order the system tries to adhere to the order dates (if necessary, with reduction measures).
If it is not possible to adhere to the basic dates and if the control parameter in Customizing allows the basic dates to be adjusted, the system adjusts the basic dates of the order during the scheduling run.
If the control parameter in Customizing does not allow the basic dates to be adjusted, the order keeps the basic dates of the planned order.
If the production order is created manually, you must enter at least one order date manually.
The scheduling type determines, which order dates you must enter.
Examples
If the system schedules forwards, you must enter the order start date.
If the system schedules backwards, you must enter the order finish date.
If the system does not schedule the order, you must enter both the order start date and the order finish date.
Basic finish date
Date on which the required quantity of the material is available (that is, the requirements date of the material).
If, on order creation, a planned order exists for the production order/ process order, the basic dates are copied from the planned order.
If no planned order exists on order creation, you must specify at least one basic date.
The scheduling type determines the basic dates that you must specify.
Dependencies
The order finish date is accurate to the day. However, for scheduling, production requires a completion date that also specifies the time. To ensure that the material to be manufactured is available on the order finish date, the completion date must be before 00:00 hours on the order finish date.
If, however, an in-house production time of 0 days is maintained in the material master, an exception is made to this rule. In this case, it is assumed that the material can be manufactured in a single workday. The completion date is then before 24:00 hours on the order finish date.
Example
The last operation of an order was completed on Thursday at 5 pm (17:00 hours). No float after production was maintained for the order.
If an in-house production time greater than 0 days is maintained in the material master record, the order finish date is Friday.
If an in-house production time of 0 days is maintained in the material master record, the order finish date is Thursday.
Scheduled start
Use
Start date for the execution of the production order.
You can either
let the system determine this date using lead time scheduling, or
enter the date as a fixed date on the header screen of the production order.
Scheduled finish
Scheduled finish date
Finish date for the execution of the order.
Procedure
You can either
let the system determine this date using lead time scheduling, or
enter the date as a fixed date on the header screen of the order.
Definition: lead time scheduling
Material Requirements Planning (PP-MRP)
Lead time scheduling calculates the exact production dates and creates capacity requirements.
Lead time scheduling via the routing
Lead time scheduling is normally carried out using the routing. In this case, it calculates the start and finish dates and times of the individual operations.
Lead time scheduling via the material master
Within MRP, lead time scheduling can be carried out using the times specified in the material master. In this case, it calculates the production start and finish dates, but does not calculate any capacity requirements.
Hope this clarify you.
Regards
Vivek
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