Indicator: Only Firm Schedule Lines that have been Transmitted
Description
Schedule lines can be firmed in the same way as planned orders or purchase requisitions within the framework of the MPS fixing logic within the planning time fence. The planning time fence represents a number of days that always extends from todays date into the future. Thus, the end date of the planning time fence moves a day further into the future every day. According to the fixing logic, existing schedule lines are firmed as soon as they fall into the planning time fence.
Schedule lines that lie outside the planning time fence at the moment and whose quantity has been changed in the planning run due to a change in requirements are also firmed (for the changed quantity) as soon as they move into the planning time fence.
The schedule lines are transmitted to the vendors via the messages in purchasing for the quantity that is recorded in the stock/requirements list at the time of transmission.
New for 3.0
If you only want to firm the schedule lines that have been checked and transmitted to the vendor in the planning time fence, there is an indicator for this purpose in Customizing from release 3.0. The indicator "Firm printed lines", determines that only the schedule lines that have been passed on to the vendor by mail are firmed.
The following situation arises for the schedule lines that, simply due to
the passing of time, eventually fall within the planning time fence: if the
MRP controller/purchaser does not confirm the procurement plan by sending the
current quantity per message transmission to the vendor, then the system firms
the quantity in the planning time fence that went to the vendor in the last
message transmission. If no message has been sent to the vendor at all, no
schedule lines are firmed in the planning time fence and instead, they are
displaced to the end of the planning time fence.
This ensures that no unchecked quantities are firmed. Moreover, the vendor can
also be sure that all schedule lines are checked before they come to him.
If a requirement is increased, the system automatically adjusts the schedule lines outside the planning time fence during the planning run. If you have set the indicator, "Firm, printed lines" and the new quantity was not sent to the vendor, then when this schedule line falls into the planning time fence, the system firms the smaller quantity that has already been sent to the vendor. For the shortage quantity, a further schedule line is created and displaced to the end of the planning time fence.
If a requirement is reduced, the system also reduces the schedule line quantity automatically in the planning run. If the new quantity is not sent to the vendor, then the system firms the old, larger quantity.
Example
| MRP run week 1 | MRP run week 2 | MRP run week 3 | |
|---|---|---|---|
| 100 | 120 | 80 | |
| 120 | 80 | 50 | |
| 80 | 50 | 100 | |
| 50 | 80 | 70 | |
| 100 | 50 | 60 | |
The planning run is carried out weekly. The first three schedule lines lie in the planning time fence and are therefore firmed automatically. Outside the planning time fence, new schedule lines are created or existing ones are changed. The schedule lines that were determined in the planning run in the first week were confirmed by the MRP controller and were also sent to the vendor. The planning run in the second week was not checked by the MRP controller. If the indicator, "Firm, printed lines" is set for the material, then in the third week, when the next non-firmed schedule lines fall into the planning time fence, they are not firmed for the current quantity, but for the old quantity that was last sent to the vendor. In the example, the fifth schedule line in the first week is for 100 pieces. In the second week, it is changed to 80 pieces. However, as this change was not transmitted to the vendor, in the third week, the old quantity of 100 pieces is firmed.
Note
The transmission of messages is a purchasing function which can be found in the purchasing menu under, Outline agreement -> Scheduling agreement -> Messages -> Print/transmit.
Change system parameters in customizing
The indicator "Firm, printed lines" is set in Customizing for MRP.
Please read the Implementation Guide for more information:
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