how to choose a appropriate lot size key and planning time fence

[Former Member]

Dear All,

Our business strategy is that we make the process order in each Thu. and firm it until next Sun. Which lot size key and PTF are the most appropriate for us?

We choose lot size U1 and PTF 7days now.But we only want to firm the process order for one week. Under current setting, the firm zone will ratchet to another 7days in Tue. So the next planned order was firmed in a long time.

Thanks & Best Regards,

May

[Former Member]

Hi May

1.>Create a planning calender using MD25 with period calculation rule as week's(week days), with every THU (4) as the period start day.

2>Assign this calander to ur material in material master.

3> create a new lot size copying PK in OM14, only change the scheduling as 1( period start= delivery date) & assign this to the material master.

This will create planned orders only on thursdays

Now about firming what do u mean by "we only want to firm the process order for one week" only planned orders get firmed not process orders ( Process orders are any way firmed)actually using firming if a planned order is firmed it remains firmed untill it is changed to process or production order.

4> use MRP type with firming type 1(P1).

5>this will see that ur planned orders created on thursdays are firmed.

Regards

Prasad

Pls reward if useful.

[Former Member]

Hi Ranga

For the MRP type, we use M1 for the finished products and PD for the component material.

Thanks,

May

[Former Member]

Hi May,

How do you run MRP, schedule it back ground every tuesday and PTF let it be 7 days and lot size based on requiement, it can be period lot size or reorder or lot for lot

Thanks

Bala

[Former Member]

Hi May,

The lot size the forum can suggest if you know about your product. That you need to decide.

What is the mrp type you are using?

Regards

Ranga