SNP optimizer cross period lot sizing.

[nitin_thatte]

Hi experts,

We want to run SNP optimizer in Daily buckets for two weeks.

However we want to ensure that when a product is planned, it should atleast produce for 3 days.

We are trying to achieve this by cross period lot size planning.

We have maintained set up operation in However we are facing problems.

1.  If we maintain minimum lot size as 3 days, system does not plan anything.  even when cross period tick is maintained in Resource master and Optimization profile (Discrete constraints tab and integration tab.

If we maintain minimum lot size as slightly less than one days quantity, system creates planned order every day. but consumes set up time with every order resulting in reduced production quantity.  So the functionality of cross period lot size does not work.  Meaning, it does not schedule only one set up operation for consecutive orders.  It takes set up operation with every planned order even when previous bucket is using same PPM.  If we see the costs, the fixed costs are counted with every planned order.

In resource master next to the tick there is an option of No cross period lot size planning/cross period lot size planning.  If we maintain cross period lot size planning in this field, optimizer gives error "PPM cannot be executed" and a suggestion that we increase the bucket length.  If we maintain "No cross period....." optimizer runs but desired results are not obtained

Has any one worked with this scenario? 

Thanking you in advance.

Nitin Thatte

[frank_horlacher]

Hi Nitin,

procedure:

1. in the resource master make the periodic lot size setting.
2. in the Optimization Profile Maintenance choose Discrete Optimization
3. In tab Discrete Optimization enter a value > 0 in the field Cross-Period Lot Size

BR Frank

[nitin_thatte]

Hi Frank,

Thanks for the reply.  We have made the settings/maintained data as listed by you.

But still we do not get the results we want.  System plans set up operation every day even though same PPM is used on previous day and next day also.

[frank_horlacher]

ok than we have to add more settings:

Procedure:

1. Set-up groups are maintained in ERP
   routing
2. check if PPM has setup group assign
3. Create setup matrix in APO
4. assign Setup matrix to resource
5. in the cost profile maintenance enter a value <0 in field setup