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period lot-sizing procedure in PP/DS Optimizer

former_member182449
Participant
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Dear Expert,

I working with period lot size weekly with period factor 1 in Product location

When I Run The PPDS Optimizer he does not respect the period lot size at the end of the period, the sequence between PlOrd. and PReqRel not working as

PReqRel coming before  PlOrd

My Questions :

1- Does PP/DS Optimizer working with period lot-sizing

2- Rescheduling: Bottom-Up can be done through PP/DS Optimization

Please Advise how I can solve my Issue ??

Best Regards

Rami 

Accepted Solutions (1)

Accepted Solutions (1)

sourabh_jain66
Active Contributor
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Hi Rami,

Period lot size is generally supported by hueristics based planning and not by optimization based planning.

For rescheduling bottom up you can use bottom up hueristics, optimizer is a different ball game.

One thing you can do is to schedule a planning job using bottom up hueristics and optimizer as two seperate steps.

please also check sap note no. 712066 for PPDS optimizer restrictions.

Rgds

Sourabh

former_member182449
Participant
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Dears,

I don't know how i can thank both of you , you deserve correct answer

Forgive me James ..... you also deserve correct answer , but what can I do ?

Kindly Regards

Rami

Answers (1)

Answers (1)

Former Member
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Exactly.

The optimizer will do both bottom-up and top-bottom in all the ways it feels it is needed in order to obtain a feasible plan and minimize whatever cost function you define (delays, makespan, setup, etc...) while respecting your capacities.

The alternative is to use heuristics in a controlled way, one after the other, but it may not work well if you want to respect capacities, it is better suited to fix date problems ie. when you have product A with component B with component C (three levels). If you plan the three products with MRP, lead times are 1 day per level and demand is for today, MRP will give you one order per level for today, while bottom-up planning applied afterwards will give you product C for today, product B for tomorrow and product A for the day after tomorrow. Optimizer would do a similar job, but would probably mix the whole plan during the process (it would affect many products). As Sourabh said, lot sizing would happen during MRP, the optimizer only reshuffling orders, not creating new ones.

thanks,

J.

former_member182449
Participant
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Dear James,

After Running Capacity leveling ,  APO create orders in daily basis as result from finite capacity

for production and transportation as example

During the PP/DS Run apo delete all this orders and create one order to cover the demand

My Issue is :

If you use optimizer or capacity leveling  to make cross finite planning to consider and make finite capacity for production or transportation , it's working fine no problem but when you run PP/DS he not respect all what you did in SNP

what's the propose from doing all this in supply network planning  ??

I know this's the standard behavior between SNP and PP/DS but  I'm little confuse , and I need to

clarification for this concept

Regards

Rami

Former Member
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Hi,

you can fix SNP orders when converting them to PP/DS, then PP/DS will not delete them and plan only the possible stockouts when demand exceeds the SNP plan.

regards,

J.

former_member182449
Participant
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Hi ,

I plan weekly in SNP and I expect to not see any over load in Capacity leveling

SNP seen the demand quantity in daily basis and consider it as overload .

How I can let snp deal with it as weekly demand ?

Thanks in Advance

Rami

former_member182449
Participant
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Hi  James,

Any Response for the last reply from me ?

BR,

Rami

Former Member
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you mean PPDS instead of SNP?

former_member182449
Participant
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No, I mean During SNP

I plan weekly in SNP and I expect to not see any over load in Capacity leveling

SNP seen the demand quantity in daily basis and consider it as overload .

How I can let snp deal with it as weekly demand ?