Lot Size Set Ups

[Former Member]

Hi All,

Please can I seek your advice on the best way for me to group my lot sizes?

I want to create 1 purchase requisition to cover any shortages I have out to my lead-time coverage and no more than this. I have tested some of the period lot sizes but I am ordering beyond my leadtime coverage in a lot of cases.

Example:

I have used a 5week period lot size, my lead-time coverage is also 5 weeks.

My part starts to go short in Week 3.

I want one pur req to cover Wk3+Wk4+Wk5 only

The results I am getting are 1 pur req created for a 5 wk bucket to cover Wk3+Wk4+Wk5+Wk6+Wk7.

How do I prevent this?

Kind Regards

Jackie

[former_member233510]

According to you, the shortage of materials start occurring on  week 3 and want to create procurement proposal only for the exact shortage quantity. Hope I understand your requirement correctly. If so, then check the lot-sizing procedure "EX". This lot size calculates the shortage by differentiating requirement from the available stock, creates single procurement proposal and you can adjust this order proposal quantity using rounding profile.

[Former Member]

Hi Rosh -

No I wish to group my requisitions to pool all shortages up to my leadtime into 1 req. So in this case I want a req for the total shortage of Wk3+4+5. If I use Ex I will get 3 reqs. If I use a 5 week period lot size I will get 1 req but it will cover too far into future (ie from Wk3 to Wk7)

[Caetano]

Hello

I think that the best approach is to create a custom lot size. On the customizing transaction OMI4,  you can define different lot sizing procedures for short and long term horizons.

You can use, for example, a monthly lot sizing procedure on the long-term horizon, in order to have a purchase requisition for each month outside the lead-time.

BR
Caetano