Days of supply, purchasing


(system) #1

The short answer is yes. The long answer is……………

 

MRP Planning: Days of Supply- This value defines how many days into the future MRP will look in order to calculate the quantity needed on a job or purchasing suggestion. The MRP engine monitors the supply quantity of a part. When it discovers a date in the schedule where a part's On-Hand Quantity falls below the Minimum On-Hand value, it uses this value as the Start Date to determine a date range. This is the range during which the Minimum On-Hand quantity must be maintained. When this date is defined, the MRP engine then adds together all the quantities that are below the Minimum On-Hand Quantity on each working day within this range. This determines the total supply needed during this specific Days of Supply date range.

 

Use Dynamic Days of Supply in Lead Time -- You select this check box to activate the Use Dynamic Days calculation. When this calculation is active, the MRP engine checks for points when the Net On-Hand Quantity is either below or above the Reorder Quantity (Minimum Quantity + Safety Stock Quantity). If the MRP engine discovers one of these points, it first determines the End Date using the Days of Supply value. It then checks for the next available supply quantity after this End Date value. The date on this next supply quantity is now used instead as the new End Date, and the Days of Supply calendar range increases. All of the demand included in the new End Date is added to the On-Hand Quantity to determine the amount to increase or reduce on the purchase suggestion, job suggestion, or unfirm job.

 

The Days of Supply modifier defines how many days into the future the MRP engine looks to calculate the final quantity needed on a job suggestion, purchase suggestion, or unfirm job. Since this window of days is a fluid calculation that depends on when MRP generates based on its Start Date and on when demand quantities move based on record changes, MRP can calculate a reduce purchase suggestion in the lead time window (MRP Scheduled Start Date + Standard Lead Time), followed by a new purchase suggestion generated outside this window using standard MRP logic. If this new purchase suggestion itself has a long lead time, you may not be able to act on this suggestion in time to satisfy demand at the correct point in the schedule. To account for this situation, use the Dynamic Days of Supply calculation. When this calculation is active, the

MRP engine checks for points when the Net On-Hand Quantity is either below or above the Reorder Quantity (Minimum Quantity + Safety Stock Quantity). If the MRP engine discovers one of these points, it first determines the End Date using the Days of Supply value. It then checks for the next available supply quantity after this End Date value. The date on this next supply quantity is now used instead as the new End Date, and the Days of Supply calendar range increases. All of the demand included in the new End Date is added to the On-Hand Quantity to determine the quantity to increase or decrease on the purchase suggestion, job suggestion, or unfirm job. This calculation continues to check for records that may cause the Net On-Hand Quantity to be either reduced by a material requirement or increased by a material supply later in the schedule. If a demand requirement increases or reduces the supply quantity again, a new End Date is recalculated and the additional increase or reduce demand and supply records are added to the expanded Days of Supply calendar range.

 

From: vantage@yahoogroups.com [mailto:vantage@yahoogroups.com] On Behalf Of mvissuet@...
Sent: Monday, October 07, 2013 4:31 PM
To: vantage@yahoogroups.com
Subject: [Vantage] Days of supply, purchasing

 

 

Does the days of supplies, in the part planning tab, work for purchasing as well, when MRP makes the purchasing suggestions?


(system) #2
Does the days of supplies, in the part planning tab, work for purchasing as well, when MRP makes the purchasing suggestions?