Partner Function Assignment

Hi All,

I have seen that this question being posted earlier but it is still unanswered.

This is regarding transaction VOPAN.

We assign the Parnter FUnctions to Partner Determination Procedure.

Then we assign Partner Detrmination Procedure to Account Group.

Partner Functions--------------->>Partner Determination Procedure------------------>>Account Group

So why do we need to assign the Partner Functions to Account Group again ?

Thanks in advance

Jack