Parent child relationship for suppliers on the three way match

I have established a parent child relationship with two existing suppliers that are on the three way match.

     A:  Parent is used for address and payments

     B: Children are on the three way match process

          1.  However, the vouchers created by the three way match process are not updating the alternate payee field for these vouchers.  Payables is performing this function manually be going into the speed release function just before issuing checks.  Is there something I am missing that needs to be populated in the address book files OR is it in the manufacturing module?

  Is there an article/document that I can reference to trouble shoot this?