Configuration of Alternate Payee at Invoice Level

Dear Friends

I have a requirement where I need pay to the supplier other then the  supplier for which invoice is raised. For example If I have raised an Invoice for X supplier then I should be able to pay the same invoice to Y supplier. I have done my own research on that and got some Oracle notes wherein it is explained that we can define alternate payee in the "Relationship" tab for supplier and mark that alternate supplier as Primary. However with this solution I have got the challenge that once I mark that alternate supplier as Primary then all