How can I set Only one coutry in the tax classification and delete the other country? 

Answer:

As mentioned before and as per OSS Note 872449 - Tax determination in Sales and Distribution, the plant assignment to the sales organization impacts the data in the material master. The note indicates:

Tax classification of the material

For example, the tax classification of the material determines whether the material is fully, half or not liable for tax. Due to this classification, you can determine different tax rates. The tax classification is determined from the material master and you can change it manually in the sales and distribution document at item level. 

The system displays the countries provided in the material master in the Sales and Distribution area: Sales organization, from the plant assignment (plant country) for the distribution channel and division (transaction OVX6).   In this case, you can store a tax classification for each tax category or condition and country. 

Also other notes indicate as;

Tax data is maintained in the material master in conjunction with the settings made in Customizing for Sales.

The relevant settings are:

- assignment of plants to sales organization
- assignment of country to plant
- assignment of country to sales organization (via company code)
- tax per country.

Note that whenever you make changes in configuration side, you need to create new material master and check.

See Also
Company's Order To Cash Process

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