Customer creation

Hi all ,

While creating a customer (XD01) I am having the following error

"Sales area Z001 Z1 Z1 is not defined for customers

Message no. F2644

Diagnosis

The sales area specified has either not been defined (i.e. there is no entry in table TVTA) or it refers to another sales area for customers (customer division/customer distribution channel in the TVTA detail screen). This means that the customer master data of the sales area entered correspond to the data in the reference sales area and customer master data only needs to be maintained for this reference sales area."

Please suggest what to do now .

Regards,

Anupam