Two percent condition Amount

Hello,<br>

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I have two percent condition at item level. When I create a sales orders with two conditions, those conditions don't have the same amount. For example:<br>

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Line Amount 100$<br>

First discount 10% = 10$ (100 * 10 / 100)<br>

Second discount 10% = 9$ (90 * 10 / 100) <br>

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I would that the two discount works with the total line amount(100$). How can I do that?<br>

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Thank you very much,<br>