Which time elements does MRP consider in backward scheduling to determine the order dates for components from dependent requirements?
Note: There are 2 correct answers to this question
Backward scheduling is a method of determining the order dates for components from dependent requirements by starting from the requirement date of the finished product and working backwards through the production structure. Backward scheduling considers the following time elements:
Operation duration: This is the time required to perform an operation on a resource, such as a work center or a machine. Operation duration is influenced by various factors, such as the quantity, the lot size, the setup time, the processing time, the teardown time, and the operation scrap. Operation duration is subtracted from the requirement date of the finished product to determine the start date of the operation.
In-house production time: This is the time required to produce a material in-house, from the start of the first operation to the end of the last operation. In-house production time is influenced by various factors, such as the routing, the work center, the production version, and the scheduling margin key. In-house production time is subtracted from the start date of the first operation to determine the order start date of the material.
Backward scheduling does not consider the following time elements:
Total replenishment lead time: This is the time required to procure a material externally, from the creation of the purchase requisition to the receipt of the goods. Total replenishment lead time is influenced by various factors, such as the planned delivery time, the goods receipt processing time, the release time, and the scheduling margin key. Total replenishment lead time is used in forward scheduling, not backward scheduling, to determine the order dates for externally procured materials.
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