The preface
We can focus on my public number, the number public in the layout better, read more comfortable.
Body part
Paste articles written two predecessors, for your reference! First:
inventory aging and sluggish materials analysis
generally high rate of turnover is low aging, high inventory aging will lead to sluggish or even scrap, such as a shelf-life of food and medicine, inventory aging is directly over the shelf life of waste, a companies dull material as high as 200 million, for a low profit margin business is definitely considered a fatal blow. Different different material different from the defined enterprise sluggish periods, how ERP defined and calculated dull material? Such Class AB materials more than 180 days is not moving i.e. sluggish, class C more than 90 days is not used i.e. sluggish, computation logic ERP may refer to the following :
Simple
. a first end of the material taken out of storage time
b slack input query time or the current time.
C idle i.e., subtract the product of more than 90 days, and the number of time and displays sluggish sluggish.
Now, DZ1 pre-suppose no material inventory, 2008/01/01 bought 1000, 2008/04/04 consume a 2008/06/06 consume a 2008/11/11 consume one to 2008/12 / 01 view of the sluggish DZ1 case, because there is 2008/11/11 consumption is sluggish when 2008/12/01 think DZ1 no analysis of the material actually stayed through the stay too cute, a total of only one year down the consumption the Sa, sluggish 997.
Enhanced
a. Preemptive timespan last time and quantity of material
B. Finally, the material re-check time and the number of libraries
C., Subtract the product i.e. slack than 90 days, and the number of time and displays sluggish sluggish.
Now, DZ1 pre-suppose no material inventory, 2008/01/01 bought 1000, 2008/04/04 consume a 2008/06/06 consume a 2008/11/11 consume one to 2008/12 / 01 view of the sluggish situation DZ1, 997 can be calculated sluggish and sluggish time, but the practice is continuously replenished inventories and consumption, assuming 10/10/2008 premium collection of 10 again (after an open purchase orders It does not purchased), according to this logic, assuming no batch management will be considered DZ1 is not dull, dull actually very thorough.
Batch-type
connected cases, assuming no material DZ1 preliminary inventory, 2008/01/01 1000 purchase, batch 1,2008 / 04/04 consume a 2008/06/06 consume a 2008/11 / 11 consumed a 2008/10/10 up again received an outstanding purchase orders of 10, lot 2, FIFO is used by default, the sluggish product is 10 997, 10/10/2008 temporarily not dull , slowly getting sluggish.
And enhanced batch-type difference:
Material transceiver is constantly ongoing, no batch management material you do not know which specific procurement warehousing of materials consumed, so you can not accurately determine the amount of materials sluggish. A simple example, the material A purchase in the past three years, 250 times 100, over the past three years and now sends the material 25 times 250, even if the purchase is based on the physical storage has storage, also probably by issuing has made storage material, if no batch management ERP system, unless you simulate batch, from the initial first storage consumption based on the total number of deduction, the deduction has been a recent storage, as in this case the history of total consumption number 6250, the procurement of the 63rd (63 * 100> 25 * 250) to meet consumption, according to the 187 and then calculate slack storage time, every time grasping all this historical business report is basically not run out of data in itself is very sluggish logical thinking, where can calculate inventory sluggish. If a batch, the batch as long as the first looks> 0 then determines whether or aging can be calculated according to sluggish simple batch timespan, of course, there are many side effects to achieve batch.
Second:
Inventory Aging
May 11, 2010 17:34 Tuesday
to discuss the purpose and subsequent analysis of inventory aging analysis, providing practical methods of operation in order to reduce inventory.
1. The aging inventory and inventory turns
...... mentioned aging inventory, inventory turns would have to say. Inventory turnover ratio is in a particular cycle, the average cost of sales and inventory balance. Period of time to measure the turnover rate of inventory assets, is one of the indicators of the overall efficiency of the supply chain reflects the business, and many companies regard it as one of the assessment of overall business performance indicators. And aged stock is a node at a certain time, the time weighted average of some or type of stock inventories. Obviously, the higher the turnover, the lower the inventory aging, but the two are not the inverse relationship (simple proof is different will be the same average inventory, storage time caused great differences inventory aging), Therefore, although both are inextricably linked, but can not simply put aging as a stock index derivative inventory turns to be treated.
2. The inventory aging analysis purposes
...... in inventory aging analysis, the goal mainly in the following two points:
First, the cost of inventory control. Inventory aging in the ERP system, should be able to query specified point in time, each inventory inventory inventory aging situation, how long that is placed in the warehouse from the warehouse since. The aging of accounts receivable and, like, the longer the aging stock of inventory, indicating slower turnover, the more tying up the funds. This is what we usually say dull material. For sluggish materials, we should analyze its causes, from the source control program to start in order to most effectively reduce ineffective inventory, achieve lower total inventory. Dull material in fact consists of two parts: working material and not slow turnover materials, materials for not working, apparently addition to the above work, should also proceed accordingly: for example, alternative or sold.
Second, the provision for inventory depreciation prepared. Equivalent to the bad debt provision for accounts receivable, inventory for the overage should also be prepared to inventory loss, the actual value of a more realistic reflection of inventory.
3. The calculation of inventory aging
...... manual calculation of inventory aging is very difficult. In the ERP system, calculated inventory aging is quite convenient. If you want to calculate a warehouse or all of the stock of inventory aging (although this number may not be practical sense), then the formula is as follows:
Inventory Aging = Σ (amount of storage lot / batch statistical point total inventory storage * time).
Let me explain one example:
in 2008 October 6, 1000 A stock inventory, the system automatically searches for storage lists, obtain the following storage lists:
the number of single-number date warehousing
NO.025 October 5 storage 200
4 October NO.023 storage 300
NO.022 3 October storage 300
No.020 October 2, storage 400
No.015 1 October storage 100
principles default FIFO, from 10 storage on the 6th of January 1000 until the full list backwards, that is, 200 (October 5th) +300 (October 4) +300 (October 3) +200 storage (October 2 of 400 200 to the value) = 1000.
then: aging Stock = 200 * / 1000 + 3000 * 1/100 * 2 + 300/3 + 200 * 1000/1000 * 4 = 0.2 + 0.6 + 0.9 + 0.8 = 2.5 days
age inventory there is another way to report, reflects the degree of concentration of the aging inventory, example II as follows:
in Stock 30 days following amounts: 1000
in Stock 30 days --90 days amount: 2000
inventory 90 days --180 amount day: 1500
more than 180 days, the amount of stock: 500
4. inventory standard setting aging
...... has been discussed above, we already know the purpose of inventory aging analysis and calculation of inventory aging, but, in reality, the management, know how long a certain time inventory stock of it? How to define sluggish materials, what criteria is it?
Here I introduce my personal thoughts:
1, the deadline set in accordance with the provision of finance for inventory devaluation. For example: Financial provisions more than 180 days, inventory impairment provision and 2 percent; more than 360 days, inventory impairment provision ratio of 5%. Stock concentration of aging then combined form, more than 180 days of the material should be processed immediately, in the above two cases more than 180 days 500 should be a provision to scale. For more than 90 days of additional materials should be concerned about.
2. The inventory turnover rate set by the company set up an inventory aging standard. Example:
inventory turnover rate is set to 1 / month, with the average age of the stock is 0.5 months, not exceed the maximum 1 month. According to the classification ABC, A-like substance 80% of the total stock, B-like substance 15% of the total stock, C 5% of the total mass inventory. Obviously, all the material is set for the same turnover rate is wrong, extra attention to the class A material, the more we order, in batches, to reduce the total inventory is the most effective. Then: assumed, B-like substance is 2 months, C materials age 4 months, under this condition, only the A-like substance is not greater than 0 when the aging 625 dated meet the requirements: 0.625 80% * + 15% * 2.0% * 4.0 + 5 = 1
3 EOQ set according to each material. In other words, the material storage time should not exceed the average consumption of economic lot of time. Under this calculation ignores the safety stock inventory impact of aging, but it is clear that applies only to compare materials consumed in uniform, with very small standard deviation.
4, reference procurement lead time to determine, storage time should not exceed the period of material procurement. Obviously, this method is more likely than the third reference value thereof.
5, if the material has a shelf life, shelf life of aging over inventory is scrapped. Then the ERP system shelf life and batch management, the risk of the stock is bound to be less than the age of shelf life.
To the above various methods for different types of material, choose to use.
The follow-up work ......
...... work in materials management, inventory aging analysis method is found one of the most effective means inventory backlog. But I found that the problem is very important, but more importantly how to solve the problem.
So the question after the discovery of material backlog of cases, found the project must take to resolve, to complete a cycle of PDCA. When reduce inventory, inventory easier to find the problem, this is a virtuous cycle.
Note that:
1, the discovery of the backlog of material, not and will not be the same attention, because management is also a cost. Engine turnover slows down, more terrible than the standard backlog.
2, inventory aging analysis, expressed in dollars than indicated by the number, more intuitive and more effective.
3, setting the standard aging, but also needed to adjust, because improving inventory turnover rate, reduce inventory invalid as the ultimate goal.
4, inventory aging analysis of hindsight, correct method is far less effective prior control is prevention. In this regard, the principle of quality management is the same.
In dealing with libraries of age, it should be noted that a library is how to determine the age, is the date of birth of each material, one is in accordance with the FIFO method, this approach is clearly needed is maintained in accordance with accounting system date or dates, If the intermediate delete a record on how to handle these large amounts of data are needed to calculate, addressed ways to prevent excessive upfront deleted lead to recalculation of the way through the checkout, the checkout sap is used in not allowed to do, for this proved to be useful, the second is a batch manner, the minimum value directly as a batch inventory date, so that each can generate aligned for storage.
1 \ storage to confirm the date of issue. Receipt of the date of adoption, or the use of the date of the first storage of goods?
If the date is put in storage, the warehouse if the allocation occurs, returns, inventory overage ..... when a series of storage business, material storage date and a sense of age can not be calculated as a library date, and should be based on the date of the first storage material to calculate the age of the library. so, for the first time how the storage date to confirm?
under 2 \ If a running account of inbound and outbound inventory control, can determine each into Slip will correspond to one or more of the storehouse, a storehouse any article that may Receipt from a single or a plurality of storage, and allow the system to strictly control and tracking the corresponding storage lists, then the number of storage on a single stock can be expressed as the number of storage = number - the number of Delivery has been out of the library, the librarian-old method of calculation can be understood as
Σ stock amount of storage lists (the number of storage - has a the number of library) (* deadline query - warehousing date) / total inventory