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Shipping a sales order item relieves each MDS name for which you set the check Relieve. You set shipment relief when you define the master schedule name--before you define or load a schedule for that name. If you associate a demand class with your MDS, the shipment relief process relieves the MDS entries that correspond to the demand class associated with the sales order.
You can change the shipment relief option after initially creating your master schedule. If you change the shipment relief on an MDS from On to Off, shipment relief stops occurring against that master schedule. If you change the shipment relief option from Off to On, shipment relief occurs on that master schedule from the date you change the option onward.
Production (MPS) relief prevents the duplication of supply. Without relief, you would need to replan your master schedule just before planning material requirements each time to obtain an accurate picture of supply and demand for your MPS planned items.
Creating a purchase order, purchase requisition, or discrete job relieves each MPS name for which you check Relieve. You set production relief when you define the master schedule name--before you enter or load a schedule for that name. If you associate a demand class with your MPS, the production relief process relieves the MPS entries that correspond to the demand class associated with the discrete job.
You can change the production relief option after initially creating your master schedule. If you set or unset the production relief on an MPS name, production relief stops occurring against that master schedule. If you change the production relief option from Off to On, production relief occurs on that master schedule from the date you change the option onward.
Oracle Master Scheduling/MRP and Supply Chain Planning also updates the MPS schedule quantities when you reschedule discrete jobs, or when you change discrete job, purchase order, or purchase requisition quantities.
Attention: Oracle Master Scheduling/MRP and Supply Chain Planning does not consume MPS entries for repetitive items. Repetitive schedules are recalculated each time the planning process runs. Therefore, it does not decrease the MPS for repetitive items.
Supply Chain Planning users can also relieve production schedules for phantom items with a planning method of MPS/DRP Planned.
To compare this picture of your master schedule with previous or future versions, you can copy your master schedule periodically (by using the Load/Copy/Merge Master Schedule window) and store the copy for later comparison. Use the Schedule Comparison report to compare the different schedules.
Note that this affects all master demand and master production schedules that have relief set to Yes.
You can also specify the direction in which the production relief takes place by using the MRP: MPS Relief Direction profile option. If you specify Backward, then forward, Oracle Master Scheduling and Supply Chain Planning relieves master production schedule entries backwards from the discrete job due date then forwards until it finds enough schedule quantity to relieve. If you specify Forward only, Oracle Master Scheduling and Supply Chain Planning relieves master production schedule entries only forward from the discrete job due date until it finds enough schedule quantity to relieve.
Attention: When you change any of these profile options you must restart the Planning Manager to activate the new profile option.
For shipment relief, the Planning Manager first looks for the specific sales order entry to find a specific schedule entry to relieve. If it does not find an entry for that exact sales order date, the Planning Manager begins at the oldest schedule entry for the item and moves forward in time, decrementing schedule entry quantities until is reaches the sales order shipment quantity.
For example, suppose you have MDS entries of 10 each on Monday, Tuesday, and Wednesday. If you ship a sales order for 25 on Tuesday, the relief process deducts 10 on Tuesday (leaving 0), deducts 10 on Monday (leaving 0), and deducts the remaining 5 on Wednesday (leaving 5). Thus, the new master schedule entries are quantity 0, 0, and 5 on Monday, Tuesday, and Wednesday, respectively.
For production relief, the Planning Manager first looks at the discrete job due date to find an MPS schedule entry to relieve. It then looks backward, up to the first schedule entry, and then forward until it finds enough schedule quantity to relieve.
For example, suppose you have MPS entries of 10 each on Monday, Tuesday, and Wednesday and you specify the MRP: MPS Relief Direction profile option as Backward, then forward. If you create a discrete job for 25 on Tuesday, the relief process deducts 10 on Tuesday (leaving 0), deducts 10 on Monday (leaving 0), and deducts the remaining 5 on Wednesday (leaving 5). Thus, the new master schedule entries are quantity 0, 0, and 5 on Monday, Tuesday, and Wednesday, respectively.
Attention: When it operates, the Planning Manager may run for a very short time only, making it difficult to determine whether is it running. To be sure, examine the messages in the Planning Manager window. Messages should increment periodically. Whether you use shipment or production relief, you should activate the planning manager and leave it running. The planning manager performs maintenance tasks vital to the proper operation of Oracle Master Scheduling/MRP and Supply Chain Planning.
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