Mapping of the right R/3 Account Group within CRM2007

Dear Forum members,

We are implementing CRM2007 together with ECC and I have a problem in the replicating of BP's.

Like in the past in the old fasion GUI when you created a Sold-To-Party you would via the Tab Classification map the right R/3 Account Group. (in our case Z001). (after the right customizing of PIDE, Number ranges, Groupings etc.)

My question is where in de CRM2007 WEBGUI can I make the mapping with the right R/3 account group when I create a Business Partner in the Role Sold-To-Party?(in our case with the Z001 account group)

Is this field just available, must it be added to a BSP page or is it something else that I miss?

Please can anybody help me?

Regards

Niels