Add custom field BuilAddress

Hello all,

I try to add a custom field for the business partner address through AET. Problem is, that is it only possible to add fields to BuilHeader BUT000, if I' right

How could I add fields to th address BuilAddress / ADRC in a professional way?

I have read a view discussion e.g.
http://scn.sap.com/thread/3279135

But I'm still not sure what's the right way. There are some nice tools like AET and EEWB. Could it be that this tools are not deliver the functionality for this enhancement?

Many thanks in advance for your answers.

Regards

Michael