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Determination of Tax Rate 
This function offers you the possibility of determining tax rates for the sale of spare parts.
You have defined in Customizing whether you can change entries for tax rate determination. You can find more information in the Implementation Guide (IMG) under Customer Relationship Management ® Transactions ® Basic Settings ® Business Add-Ins ® Business Add-In for Field Selection.
To determine the tax rate, you can enter the country, and optionally the region, tax type, and tax group for order items in a sales order. The system offers you input help for this. The tax group is determined from the country, or optionally from the region and tax type. You can store a default value for the tax group of the product so that you only have to enter the country, or optionally the region and the tax type when the tax group does not differ from the default value. You can process the tax group belonging to the product in the product master data of the master record. However, you do not manage products that are exclusively delivered by external vendors as a master record in your system. You can define them in Release 1 via a dummy product with which you process the tax rate in the sales order. In Release 2 you can process the products of external vendors via a product that you have not created as a master record.