I am having a very odd error, and it only happens sometimes. I am
creating an object structure and then assigning that to the arguments
property of my mx.rpc.soap.Operation object like this:

op.arguments = args;

I then call the SOAP method like this:

var call:AsyncToken = service.GetDataByGrouping();
call.addResponder(responder);

Sometimes (I've not figured out a pattern), Flex somehow loses all of
the contents of the arguments property and sends nulls. It is sending
the same number of nulls as there were properties though, so I am
super confused. The Operation.arguments object is still populated with
the correct data, but none of it gets sent. Does anyone have any idea
what is going on here? I am pasting the entire method from my delegate
below. 

// in the delegate constructor
service = ServiceLocator.getInstance().getService("cmws") as WebService;

// in the method called by my command class
var op:Operation = service.getOperation("GetDataByGrouping") as Operation;
op.resultFormat = "e4x";
// temp object to store arguments
var args:Object = new Object();
args.groupingRequests = new Object();
args.groupingRequests.GroupName = "RPRTool";
args.groupingRequests.Parameters = new Array();
... populate Parameters array ...
op.arguments = args;    
var call:AsyncToken = service.GetDataByGrouping();
call.addResponder(responder);

// results in sendign an object like this
<ns1:groupingRequests
xmlns:ns1="http://fmr.com/BackOffice/ClientMeasures";>
   <ns1:DataGroupingRequest/>
   <ns1:DataGroupingRequest/>
   <ns1:DataGroupingRequest/>

Ben






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