Customer Master (Control Data) 
Definition
The part of the customer master record where you record general information about a customer.
To access the customer master, on the SAP Easy Access screen, choose Accounting ® Financial Accounting ® Accounts Receivable ® Master Records ® …
For
generic information about the customer master, see 
Customer Master
Data.
Use
On the Control Data tab, fill out the fields as follows:
...
1. If the customer is domiciled in Poland, enter its NIP number in the Tax Number 1 field.
2. If the customer is domiciled in another European Union country, enter its VAT registration number in the VAT Reg. No. field.
The system can then print these tax numbers on all documents involving taxes, where appropriate.
See also: