Robotframework SudsLibrary generating additional element when it call "Call Soap Method" - soap

Question

When trying to execute following robotscript, it added additional element to the login element..
Library Selenium2Library
Library Collections
Library String
Library uuid
Library Dialogs
Library SudsLibrary
Create Soap Client http://xxxxxxxxx:18080/xxxxx_b/xxx?wsdl
${dbl array}= Create Wsdl Object logIn
Set Wsdl Object Attribute ${dbl array} username xxx
Set Wsdl Object Attribute ${dbl array} password xxxx
${result}= Call Soap Method logIn ${dbl array}
log to consol ${result}
original request format
<soapenv:Envelope xmlns:soapenv="http://xxxxxxxxxxxxx/x/x/" xmlns:ws="http://xxxxxxxxxxxxxxx/">
<soapenv:Header/>
<soapenv:Body>
<ws:logIn>
<!--Optional:-->
<username>xxx</username>
<!--Optional:-->
<password>xxx</password>
</ws:logIn>
</soapenv:Body>
</soapenv:Envelope>
Generated code :
<SOAP-ENV:Envelope xmlns:ns0="http://xxxxxxxxxxxxxx/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="h
ttp://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header/>
<ns1:Body>
<ns0:logIn>
<username>
<username>xxx</username>
<password>xxx</password>
</username>
</ns0:logIn>
</ns1:Body>
</SOAP-ENV:Envelope>
How to remove additional username tag?
<username>
<username>xxx</username>
<password>xxx</password>
</username>

Answer 1

Very likely the problem is that the login method does not take its arguments wrapped in an object, but directly. Suds creates types for all methods, but these are not needed to call the methods.
If you look in the output from Create Soap Client you will probably see something like logIn(username, password). That means you pass the arguments directly and not in some object.
Library Selenium2Library
Library Collections
Library String
Library uuid
Library Dialogs
Library SudsLibrary
Create Soap Client http://xxxxxxxxx:18080/xxxxx_b/xxx?wsdl
${result}= Call Soap Method logIn some_username some_password
log to console ${result}