Difference between MRP Type PD and VB

Hi All,
I have a scenario, in which i have some doubts which i have mentioned below.
1. MRP Type 'PD' with maintaining Safety stock for the materials which have longer lead time. Will the safety stock which exists will cover both excess material consumption within the replenishment lead time and any additional requirements that may occur due to delivery delays.
2. MRP Type 'VB' with maintaining Safety stock, reorder point, Maximum stock level for the materials which have longer lead time. Here the safety stock which exists will cover both excess material consumption within the replenishment lead time and any additional requirements that may occur due to delivery delays.
3. MRP Type 'ND' with maintaining Safety stock.
Of all these 3 MRP Types, what will be the outcome after doing the MRP Run? Should I go for separate MRP run for VB type materials?
Please give the solution.
Regards,
Ram

Hi Ram,
PD: this requirement type considers teh requirements in terms of Sales orders,PIRs stock transfer requireements etc for the material and then does the net requirement calculation and creates procurement proposals accordingly. it also considers safety stock while doint the net requiremetn calculation.
VB: generally used for items with a fairly consistent consumption pattern. here the requirement depends on the safety stock and the current stock. if the current stock goes below the reorder point, then only a requirement is generated. besides the safety stock it does not consider any othe requirement.
ND; these items are not planned. so no effect of MRP run
normally for the VB type materials, a background job is scheduled that does the MRP run at predefined schedules.
even for items with PD, the MRP job can be scheduled at predefined intervals according to the MRP controllers or some other parameters like production schedulers, MRP group etc.
please let me know if u need more details
Edited by: vishal ashar on Jan 21, 2009 7:22 AM

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