Alternate item

Dear All,

In AX 2009, I have an item XYZ. I have declared item ABC as alternate item for XYZ. How do I use these two items alternatively for Production, Purchase, Sales?

When I run planning engine, how & in which case do I get instruction from the system about using alternative item?

This is very urgent.



It does not work like that, it is ONLY an alternative in sales, certainly not production.