The Level 1 calculation considers various parameters and their settings.
If you request rolling, the estimated quantity on hand development corrects the master schedule proposals after the planning time fence. This means that the first master schedule after the planning time fence is adjusted by the estimated quantity on hand development between the run time and planning time fence. For example, if there is an excess part quantity of 100, it is subtracted from the first master schedule proposal after the planning time fence.
Level 1 calculation considers any specified lot sizes. This information is retrieved from the planning data section in the inventory part register. If the minimum and maximum lot sizes are set to zero (0), the lot size is unlimited.
Level 1 calculation consider rate by period. Proposals out side planning time fence will be created according to rate. If forecast exceed specified quantity for the period will excess quantity be moved to pervious period/s until PTF is reached.
This controls whether the Planned Dependent Demand generated due to exploded MRP demands, exploded MS receipts of Parent part or Planned Distribution Orders should be visible in MS level 1.
This controls whether the Planned Dependent Demand generated due to exploded MRP demands, exploded MS receipts or Planned Distribution Orders and Actual Dependent Demand generated due to Shop Orders, Purchase Orders, Production Schedules and Released Distribution Orders should Consume MS forecast.
Fixed master schedule proposals remain in existence until the run date, but they do not affect any calculations within the time fence demand. Variable proposals are set to zero (0) so that they can be recalculated outside the planning time fence.
Site level attributes control how master scheduling level 1 plans for a part. Parts are registered for each site. If the part is handled by project MS then it is registered for both the site and PNG. The selections that you make in the Manufacturing tab of the Site window determine how the system processes the part during master scheduling. Selecting the Use Released Purch Reqs in Planning check box causes master scheduling to not delete purchase requisitions in status Released at the start of the master scheduling run. These are viewed as supply later in the master scheduling process.
When demand for a part arises, shop order requisitions, production schedules, or purchase requisitions are created from the fixed master schedule proposals within the planning time fence. Multiple requisitions or schedules will be created depending on the maximum, minimum and multiple values set in the Inventory Part/Planning Data tab. However, this kind of supply is created only if the he Proposal Release field in Inventory Part/Planning Data tab is set to Release, indicating supply for the part is not managed by Kanban circuits.
If you specify that fixed master schedule proposals are to be created automatically, this happens when the variable proposals fall within the planning time fence. Quantity on hand development and quantity available to promise are based on the current quantity on hand minus safety stock.
The Master Schedule Receipts column in the Receipts tab shows the master schedule receipts, both Proposed and Fixed, generated by the system. The master schedule receipts, in the normal course of events, cross the planning time fence and may be set to state Fixed by the system, if indicated by the user. After this, the system generates supply proposals depending on the type of part. If it is a discrete manufactured part, then shop requisitions are generated, and the Schedule Orders column is updated to reflect this. If it is a repetitive manufactured part, then production schedules are generated, again updating the Schedule Orders column. When these supply proposals are converted into shop orders or firm production schedules, the Firm Orders column is updated to reflect this, and the Scheduled Orders column is also updated to reflect the change in status of the supply. When the shop orders are released, the Released Orders column is updated to reflect this, and the Firm Orders column is also updated to reflect the change in status of the supply. The Master Schedule Receipt column is updated only after the supply goes past due.
In a situation where parts are mainly defined as end products in some structures and as components in several other structures, such parts will have dependent and independent demands due to its nature of how it is defined in the structure. If such Component parts are planned by MS or defined as MS level 1 parts the Supply proposals for parent parts created by MS are broken down and they explode demands to these MS planned Components as planned Dependent Demands. During MS level 1 calculation demand explosion stops when it hits MRP planned component.
When the Level 1 Calculation is performed for an entire it considers the low level coding of the parts. It starts with the lowest level code i.e the top parts. This is very useful if there is a scenario where not only the end product kits but also their individual products have forecast. So consider a scenario where the bathroom ceramics are manufactured and sold. Three parts are manufactured and sold; Sink&Tap package, Sink and Tap. There are individual forecast for all three items in Ms Level 1. When MS Level 1 calculation is performed it starts with the Sink&Tap part and when it is calculated the system explodes the MS receipts to Sink and Tap. Then the system continues with calculating Sink and Tap. These parts considers the exploded MS demand from Sink&Tap as a planned dependent demand. When running the MS Level calculation part by part, it will consider the exploded MS demand from previous calculation.
Restriction: The multilevel MS Level 1 calculation will only consider consecutive MS planned parent-child in the product structure.
You can perform master scheduling for a single site, or alternatively execute master scheduling for multiple sites in support of a multi-site supply chain environment. Parts supplied from another site are defined as multi-site planned in the Supplier for Purchase Part window, indicating that the supply comes from an internal supplying site. Master scheduling generates distribution orders from fixed master schedule receipts for these material move requirements.
MS level 1 calculation can be performed by Integrating with CRP. When performing MS level 1 calculation alone, it considers Site manufacturing calendar. Therefore Shop order requisitions generated by the process will have start date calculated based on site manufacturing calendar,
When MS is performed integrating with CRP , Shop order requisitions generated by MS will be backward scheduled and the start date of shop order requisitions are calculated considering the relevant Work centers / resources and Work center connected calendar availability. In this way more accurate results can be achieved
After Performing MS level 1, MRP process can be started with plans supplied for lower level components.