Alternate Group in BOM

Hi experts,
I'm having the problem with Alternate group in BOM. I'm maintaining the the raw materials in BOM i.e A1,A2,A3,A4 like that number of materials is there.
I'm grouping the materials with alternate group
A1: Alt Grp-01, Priority-1, Strategy-2, Usage-100% 
A2: Alt Grp-01, Priority-2, Strategy-2, Usage-0% 
A3: Alt Grp-01, Priority-3, Strategy-2, Usage-0% 
A4: Alt Grp-01, Priority-4, Strategy-2, Usage-0% 
I given the qty for all raw materials is 100kg.
While i'm converting planned order to Process order. The BOM materials is taking as
A1 - 1000kg
A2 - 0kg
A3 - 0kg
A4 - 0kg
Why 1000kg taken and I don't need the materials A2, A3 and A4 in the process order. Is there any option to get drop-down list. May be its customizing.
Naren

Dear
Why do not your go for Discontinued Material  concept in case if  you think that A2/A3/A4  should be be considered based on the stock avaliablity .
In MRP4 view for material A1 , you can keep the Discontinued Material  , Effective Out Date , Discontinued Material Indicator as 1 so that when ever there is a stock  un-availablity , it  should be considered while planning and sub sequently in process order .
When copiying BOM to Prococessd order , there is no operatunity to change the qty   because it happens automatically based on the order type dependent parametrs for process order (OPL8 ) but you can change the qty in process order change mode -compoenet over view .
If you are maintaining production verion , you can implement BAdI MD_MODIFY_PRODVERS or MODIFY_PRODUCTION_VERSION based on  stock situation .
Regards
JH

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