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May 14, 2009 at 08:42 AM

Forecast base planning (Seasonal Model)

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Dear All,

We are trying to implement the forecast based planning with the manual model selection as SEASONAL , here i did the basic required settings like

Maintained the MRP type as VV (Forecast base planning), then forecast views are maintained for the material.

Hist. periods 12 Forecast periods 2 Periods per season 12

Historical value defined as

04.2009 0 1,000

03.2009 0 1,800

02.2009 0 1,200

01.2009 0 1,000

12.2008 0 800

11.2008 0 200

10.2008 0 100

09.2008 0 500

08.2008 0 2,500

07.2008 0 6,500

06.2008 0 3,500

05.2008 0 2,500

Control data

Initialization X Tracking limit 4.000

Model selection Selection procedure 1

Optimization level F Weighting group

Alpha factor 0.20 Beta factor

Gamma factor 0.40 Delta factor 0.30

Forecast value as below

Basic value 1800.000 Trend value

MAD Error total

Period Orig. HV Corr. HV Ex-post FV Orig. FV Corr. FV Season F C

M 05.2009 2500 2500 1.39

M 06.2009 3500 3500 1.94

Can any one explain how this basic value and seasonal index calculated

I know very well it has derived the values with some formulas, if i am correct it has used this formulas

http://help.sap.com/saphelp_erp60/helpdata/en/7d/c2821c454011d182b40000e829fbfe/frameset.htm

can any one explain in detail how it is calculating

Have any one come across this requirement, please let me know issue is vital.

Thanks in advance

Regards,

Ganesh