BOM: Component Substitution

Question

Hi All,
How to set up in the system for auto substitute BOM component when the main component not available. I have tried the alternative item where the substitute item also maintained as BOM item and assigned alternative group as 1, priority 2, strategy 2, usage probability 100% as well. When I perform MD02, the result it seems not correct because system create PR for the main component even though the stock is zero. My requirement system auto switch to alternative item due to the substitute component still plenty enough stock.  Your advice is appreciated.
Best regards,
Mahnansa

Answer 1

Dear Mahnansa,
Plz find Mr. Mangalraj inputs on Altenative items in BOM
Eg:
If there's a material Alt2 which can be used instead of a material called Alt1,now we will first form an Alternative item group using this 2 material.It can be more than 2 materials also.
Now in our case after u enter Alt1 as the line item for a HALB or FERT,select that entire row and click on Item details or Press F7.In Item data screen,in the bottom under general data u can find the field for Alternative item group.
Click that and enter the values as follows
A-Alt Item Group
2- Priority
2- Strategy
70% - Usage probability ,now come back.
Now enter Alt2 as the line item and after that as i said select that row & press F7.
Click on Alt.Item group button and enter the values.
A,
1,
2,
30%.Now save.
Now let's assume this BOM is used for a HALB.Let's assume 10 quantity is mentioned in the BOM for each of this line item.
Now if there's PIR for say 100 quantity
After running MRP for the HALB the requirements will be seen as Alt1 700 required & Alt2 300 required.
Here for the planning Only Usage Probability comes into picture.
When you are doing the production booking for making 100 quantities,the system shows 1000 quantity of Alt1 and no Alt2 will be seen in good's movement's screen.
Now the priority comes into picture,as we have given priority as 1 to Alt1 the systems proposes 1000 quantity of Alt1.
So while planning Only usage probability is considered and requirements fallas as per that.
While doing Production booking priority comes into picture.
So Here as we have maintained priority 1 and strategy as 2 for Alt1,the systems proposes 1000 quantity of Alt1.
If your strategy is then the planning & production will be as per the usage probability.
Second case:
If for Alt1 A & for Alt2- A
2 1
2 1
70% 30%
Planning will be 700 & 300 of Alt1 & Alt2.
But for production booking 1000 & 300 of Alt1 , Alt2 will be proposed by the system.Because For Alt1 though the priority is 2,but its strategy is 2.
For Alt2 priority1 but strategy is 1(Manual maintenance).
also Plz check the below links
[Alternative item in BOM;
[Alternative BOM;
[http://help.sap.com/saphelp_erp2005vp/helpdata/en/f4/7d3f9344af11d182b40000e829fbfe/frameset.htm]
Regards
kumar