on 05-24-2012 10:53 AM
Hello experts,
we are using an SNP heuristic (Plng book in weekly buckets) to calculate PReqs from an external suppliers. Right now we apply a periodic lot size of period type = M and number of periods = 1 which results in 1 monthly aggregated PReq. This works okay but we want to place the PReq always at the beginnning or end of the month and not directly at the place where the first undercoverage appears. Therefore we tested the so called "Lot Size Strategy" (APO Material master Tab "Lot Size" --> "Procedure) with values 1 and 2 but with no satisfacory result and even strange behaviour that SNP starts creating weekly PReqs again instead of monthly.
Can somebody help with this - we would like to understand how we can make use of the "Lot Size Strategy" and of the other switch called "Start of Lot Size Grouping". In addition - how does the period factor overlay this control - we are using a Period factor = 0,01 which means the PReq is being placed at a Monday of the weekly buckets.
Regards
Thomas Schulze
Hi,
Parameters Lot size strategy and Start Lot size Grouping are relevant for demands only. They don't influence the proposal generation (i.e. PReqs).
Consider the following example.
Period Type: M
No. of Periods: 1
Case 1:
Lot Size Strategy: Blank
Start Lot Size Grouping: Blank
Case 2:
Lot Size Strategy: Blank
Start Lot Size Grouping: X
Case 3:
Lot Size Strategy: 1
Start Lot Size Grouping: Blank
Time buckets W1 W2 W3 W4 W5 W6
Prod X demand 0 5 5 3 4 5
Combined demand(1) 0 13 0 0 9 0
Combined demand(2) 0 17 0 0 0 5
Combined demand(3) 13 0 0 0 9 0
If stock on hand is less than the target stock level, a proposal (i.e. PReq in your case) is generated. The period factor settings influence the start time of the proposal.
To group and place your Preqs either at the beginning or ending of the monthly period, you may either use a different time bucket profile with monthly buckets and appropriate period factor. The other option could be using a macro to group the proposals generated by SNP.
Thanks,
Rajesh
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