Field KNA1-ICMSTAXPAY as tax classification in CRM 7.0

Hi,

We need to make available field KNA1-ICMSTAXPAY in BP master data, it is part of Brazil localization.

I did not find any sap note or post on how to enable it in CRM BP master data, I belive it needs to be configured as a new tax classification field.

I wounder if someone already had to configure it in CRM.

Regards

Mauricio