Business Partner Master Data 
Use the business partner master data to record and retrieve business partner (customers, vendors, and leads) information and schedule business partner activities. Business partner information typically includes:
Company details, including addresses and telephone numbers
Business partner contact persons, including telephone numbers and E-mail addresses
Logistic details
Tax information
Accounting information
Details of payment terms
The master data forms the basis for all sales and purchasing documents, and activities involving a business partner. You can also use the data to analyze your business partner relationships in detail.