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.

Regards,

Shreenivas

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