CA Service Management

Hello, people i wanna know if is posible use soap method for update a log comment value like a description, analyst, etc. y try to do it something like this, for update a value but doesn't work

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://www.ca.com/UnicenterServicePlus/ServiceDesk">
<soapenv:Header/>
<soapenv:Body>
<ser:updateObject>
<sid>1997028349</sid>
<objectHandle>alg:12915863</objectHandle>
<attrVals>

<string>time_spent</string>
<string>3</string>

</attrVals>
<attributes>
<!--1 or more repetitions:-->
<string>id</string>
</attributes>
</ser:updateObject>
</soapenv:Body>
</soapenv:Envelope>

the error returned is 

<ErrorMessage>Error setting attr 'time_spent' on object 'alg:12915863' to value '3'</ErrorMessage>
<ErrorCode>1003</ErrorCode>

thanks for your help

Did you tried to use duration format for time spent, since this field is of type duration

<string>time_spent</string>
<string>00:00:03</string>

Hello,

it doesnt work, i try to use 

<string>description</string>
<string>prueba</string>

but it doesn´t work

what if you use action_desc instead of description?