Customer / Vendor Master Dual Control - Sensitive Fields

Dear SAP Experts,

I have configured a business requirement to extend the Senstive Field functionality towards customer master. I have defined the new Customer group and also assigned the fields. Every time a change to the Customer master record (KNA1 and KNB1) fields are changed, the message pops for the confirmation to be done thru FD08/FD09.

The only question I have is the relevance behind this control as even after the changes not yet to be confirmed, the system is allowing me to bill the customer (Sd billing) and pass the entry to FI accounting? On the other hand the Vendor functionality does not allow a billing run unless and until the changes are confirmed. My question is what is the relevance of the customer master. Can anyone who has an idea about this provide some insight about the dual functionality of this sub module.

Rgds,

Abhai