Item substitute functionality linking Item structure

Summary:

Hi PIM Gurus,

In PIM, I am setting up substitute item for example for item ABC , defined substitution as XYZ on Item Master

If I use item ABC as component in any item structure , how does the substitution gets associated at item structure. Is there any Validation which would restrict any other item as substitute on Item Structure apart from XYZ?

Can you Please help how Item substitute can be leveraged effectively on Item Structure?

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