Soap Request Element Disappears

Dear Support,

I have a strange problem - I have a web service request (below) which works fine - I save it and close the request. When I re-open the request one of the elements in the request is missing - and hence fails validation. I have repeated the issue many times. The line that always disappears is:

<UserAuthRequest>
<UserLoginName></UserLoginName>
</UserAuthRequest>

WORKING REQUEST
<soap:Header>
<Header xmlns="www.finetre.com/webservices">
<SessionId xsi:nil=""/>
<TransactionType></TransactionType>
<Test>false</Test>
<ServiceVersion></ServiceVersion>
<RequestorId></RequestorId>
<RequestorKey xsi:nil="true"/>
<ResponderId>WACHOVIA_SECURITIES</ResponderId>
<ResponderKey xsi:nil="true"/>
<RequestGUID></RequestGUID>
<RequestSentDateTime></RequestSentDateTime>
<RequestReceivedDateTime></RequestReceivedDateTime>
<ResponseSentDateTime></ResponseSentDateTime>
<ResponseReceivedDateTime></ResponseReceivedDateTime>
<Extensions>
<Extension>
<Parameters>
<Parameter>
<Name>APPLICATION_ID</Name>
<Value></Value>
</Parameter>
</Parameters>
</Extension>
</Extensions>
</Header>
</soap:Header>
<soap:Body>
<TXLifeFundRateRequest xmlns="www.finetre.com/webservices">
<TXLife xmlns="http://ACORD.org/Standards/Life/2">
<UserAuthRequest>
<UserLoginName></UserLoginName>
</UserAuthRequest>
<TXLifeRequest PrimaryObjectID="">
<TransRefGUID></TransRefGUID>
<TransType tc=""/>
<TransSubType tc="1008600002"/>
<TransExeDate></TransExeDate>
<TransExeTime></TransExeTime>
<OLifE>
Thank You,
Deepa