Phantom Item defined as a Substitute Item in BOM, ASCP Engine is not considering it

Dear All,

we have requirement , where we defined one Phantom Item (PHTEST1) as a Primary item in the BOM and for the same Phantom item we have defined (PHTEST2) as the substitute item .

when we run a constrained based ASCP Plan , the Primary Phantom item (PHTEST1) is considered and planned orders are released . But the Substitute Phantom item defined against the Primary Phantom is not considered .

Do we need to enable any Profiles or any other setups to be done.

Please suggest .

Thanks,

Pranathi