MDG-C : How to change account group in ERP customer

Hi Gurus,

We are implementing MDG 6.1 in co-deploy mode.

What is the simplest strategy to be able to edit the account group in Customer record in MDG-C?

I read that before : http://scn.sap.com/thread/3314802

I understand account group is determined by config related to BP role category FLCU01 (if we pick that one) but it is self-evident we want to choose the account group.

Thanks in advance