Help with GetCurrentExchangeRate web service

Hi all
I would like to test GetCurrentExchangeRate web service (
<http://webservices.gama-system.com/exchangerates.asmx>
http://webservices.gama-system.com/exchangerates.asmx), but I don't
understand how e what parameters I need to pass.
I tried with SOAPUI, but I always receive the answer
"<GetExchangeRateResult>-1</GetExchangeRateResult>"
Doe's some one know this ws or can help me how to pass parameters ?
This what I sent via SOAPUI
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope";
xmlns:web="http://www.gama-system.com/webservices";>
<soap:Header/>
<soap:Body>
<web:GetExchangeRate>
<!--Optional:-->
<web:strBank>SKB</web:strBank>
<!--Optional:-->
<web:strCurrency>EUR</web:strCurrency>
<!--Optional:-->
<web:strDate>2017-11-01</web:strDate>
<web:intRank>0</web:intRank>
</web:GetExchangeRate>
</soap:Body>
</soap:Envelope>


And this the answer



<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";>

<soap:Body>

<GetExchangeRateResponse
xmlns="http://www.gama-system.com/webservices";>

<GetExchangeRateResult>-1</GetExchangeRateResult>

</GetExchangeRateResponse>

</soap:Body>

</soap:Envelope>



Thanks in advance

Gio