Sales area is changed while the order is created
I have a below issue,
For the customer 1234 it is created for the sales area (1000/10/00),but when the sales order is created it is saying Customer is not defined for the sales area 1000/20/00, but the common distribution channels are maintained individully for both 1000/10 and 1000/20.
If i create the Customer for both 1000/10 and 1000/20, when the sales order is created with the sales area (1000/10/00) it is getting changed to 1000/20/00.
Pls suggest the reason for this.