Net req calculation and re-use mode questions in PPDS

[Former Member]

Hello -

I am trying to standard lot heuristics with different Net Requirements Calculation procedures and re-use mode/ re-use strategy.

I have understood technically what the system is doing but I am having trouble understanding the business benefits of using these different settings.

If you can help me with these 2 questions, It will be great help for me:

1) As far as I have understood, the end result would be same if I use " use suitable receipts/FIFO " as re-use strategy/mode OR " delete unfixed orders/explode fixed receipts again".

So the question is why would we care to choose one mode/strategy over the other? Why would we care to re-use existing receipts or not?

2) Also, what are the benefits of "re-exploding fixed receipts again". Why would I want to re-explode fixed receipts?

Appreciate all your help!

Varun

Edited by: Varun Muni on Jul 24, 2008 8:58 PM

[Former Member · Accepted solution]

Hello Varun,

I would explain yr 2nd question first & then first question

2) Also, what are the benefits of "re-exploding fixed receipts again". Why would I want to re-explode fixed receipts?

- Reexploding of fixed reciepts in Planning is required to take care of current Master data changes if any.

Ex Change of operation times, resource capacity , sequence of operation.

If reuse mod is Reexplode fixed reciepts, then all fixed reciepts are reexploded/replaned with modified master data

else they are retianed as it is in new planning run

1) As far as I have understood, the end result would be same if I use " use suitable receipts/FIFO " as re-use strategy/mode OR " delete unfixed orders/explode fixed receipts again".

So the question is why would we care to choose one mode/strategy over the other? Why would we care to re-use existing receipts or not?

- Results of plannin with these modes can not be the same at all the time. High level difference is as follows:

1) In "use suitable reciepts" does not delete the unfixed receipt elemnt unlike "delete unfixed orders/explode fixed receipts again"

2) In "use suitable reciepts" new procurement propsals are generated if requirement can not be satisfied with existing unfixed receipts where as in "delete unfixed orders/explode fixed receipts again" all unfixed reciepts are deleted & recretaed as per new calculation.

3) In "use suitable reciepts" fixed recipts are not exploded again where as in "delete unfixed orders/explode fixed receipts again" all fixed reciepts are reexploded again in planning run

Hope that I was able to explain your query. I have given very high level difference. You may carry out multiple planning run to analyze the difference

Revert in case of any doubt

With regards

Mangesh A. Kulkarni

[Former Member]

pl check the links in help that explain this better

http://help.sap.com/saphelp_scm50/helpdata/en/bd/59e389b64211d5b3fd0001029d90a9/content.htm

http://help.sap.com/saphelp_scm50/helpdata/en/e9/0357d24d44684db767684340369d30/frameset.htm

re exploding fixed receipts will usually result in more time taken for planning. and deletion of manually created planned orders which might be part of the business process