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If the available stock is zero and the discontinuation date is in the past, the material requirements planning (MRP) process will be affected. MRP will not create any planned orders or purchase requisitions for the discontinued component. Instead, it will create a discontinuation indicator in the MRP list and a discontinuation message in the exception message list. This will inform the planner that the component is no longer available and that a follow-up material should be used instead. References: [SAP Help Portal] - Discontinuation of Materials.

A production planning run in Advanced Planning (PP/DS) is a process that optimizes the supply and demand situation for a set of materials and locations within a given planning horizon. The possible results of a production planning run are:

• Planned Order: A planned order is a proposal for internal production or external procurement of a material. A planned order can be converted into a production order or a purchase order, depending on the source of supply. A planned order can also be firmed, which means that it is not changed or deleted by subsequent planning runs.
• Production Order: A production order is a document that defines the operations, materials, resources, and costs required to produce a material. A production order is created from a planned order or directly by the user. A production order can be released, confirmed, and settled as part of the production process. References: [SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 181; [SAP Help Portal: Production Planning Run].

Lead time scheduling is a method of scheduling production orders that calculates the start and finish dates of each operation based on the operation duration, interoperation time, and other time elements. The time elements that are relevant for lead time scheduling of a production order are:

• Setup time: The time required to prepare the work center for the operation, such as changing tools, adjusting machines, or cleaning the work area.
• Processing time: The time required to perform the operation, such as machining, assembling, or testing the product.
• Teardown time: The time required to restore the work center to its original state after the operation, such as removing tools, resetting machines, or disposing of waste.
• Interoperation time: The time between two consecutive operations, such as transportation, waiting, or inspection time.
• Float before production: The time buffer before the scheduled start date of the production order, which can be used to compensate for delays or changes in the production plan.
• Float after production: The time buffer after the scheduled finish date of the production order, which can be used to compensate for delays or changes in the production plan.

The opening period and the total replenishment lead time are not relevant for lead time scheduling of a production order. The opening period is a parameter that defines the earliest possible start date of a production order, based on the material availability date and the planning time fence. The total replenishment lead time is a parameter that defines the total time required to procure or produce a material, from the time the requirement is identified until the time the material is available for use.

References: [Production Planning with SAP S/4HANA], pages 177-179; [SAP Help Portal: Lead Time Scheduling].