Both customer account group are same, basically its not only one customer, the behaviour apply to thousands of customers.
I have the following observations that's why system give the message and looking for any option for this.
when in manual payment of rebate I input the value of rebate and save it, system automatically create the credit memo request, and the same customer is saved along with the sales area at header level, like 12345, 1000+10+10,
when I use va02, and change the customer system cant change the header data sales area to 2000+10+10, so its simply give the error message, and document type also assign on both sales area, system basically cant re-determine the sales area.
So is there any possibility for this.
regards,