Usually, company use different Vendor group for different categories of vendor.  Each group can be separated as regular or irregualr vendors or one-time vendors.

Each vendor master can have different fields set as required, optional or suppressed.

Start transaction OBD3 to configure the Vendor Account Group for :-

• General data      - Valid for vendor master irregardless of the company code used.
• Company code data - Valid at company code level only.
• Purchasing data        - Mainly for MM.