Tax classification for various sales area

Hello, my question is this:

I have a client that is created for 2 sales area, for example:

1.- Customer: 1000

Sales Area:

Sales Org: 1001

Distrib. Channel 04

Division: 02

Tab "Billing Documents"

Taxes -> Tax Classification: 1

2.- Customer: 1000

Sales Area:

Sales Org: 0216

Distrib. Channel: 07

Division: 07

Tab "Billing Documents"

Taxes -> Tax Classification: 0

When I put the tax classification to 0 the system changes my tax classification for other sales area.

Is there any way that for the same customer and various sales areas may have different tax classification?

Thanks and Regards