Tax Registration Number fields

Entity Type: This refers to the Tax Registration Entity Type Domain table. It is mandatory and there is no default. Supported values are: Carrier, Customer and Third Party Logistics Company. Entity Type cannot be modified once the Tax Registration Numbers table entry has been created.
Entity ID: Will refer to a Carrier ID, Customer ID or to the Logistics System Code from the Global Settings, depending on the value assigned to Entity Type. Entity ID must be supplied when the Entity Type is Carrier or Customer; Entity ID will default automatically when Entity Type is Third Party Logistics Company. Entity ID cannot be modified once the Tax Registration Numbers table entry has been created.
Tax Code: Refers to an entry in the Tax Codes table. It is mandatory and there is no default. There is a one-to-many relationship between Tax Codes and Tax Registration Numbers. Tax Code cannot be modified once the Tax Registration Numbers table entry has been created.
Tax Region: Refers to a zone in the Zone table that has been associated with the Tax Zone Group. There is no default. Tax Region cannot be modified once the Tax Registration Numbers table entry has been created.
Tax Registration Number: The government assigned Tax Registration Number. It is mandatory and there is no default. Tax Registration Number is editable in change mode.