Writing a single value to an array with the .NET SDK|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Hello,

I am trying to write a single value in an array of booleans. My code looks as follows:

WriteValueCollection nodesToWrite = new WriteValueCollection();
WriteValue writeVal = new WriteValue();

writeVal.NodeId = new NodeId(nodeID);
writeVal.AttributeId = Attributes.Value;

writeVal.Value = new DataValue(new Variant(true));
writeVal.IndexRange = "1";

nodesToWrite.Add(writeVal);

StatusCodeCollection results = null;
DiagnosticInfoCollection diagnosticInfos;

session.Write(null,
nodesToWrite,
out results,
out diagnosticInfos);

Unfortunately I get a BadWriteNotSupported as a reply. I've tried setting writeVal.Value.Value to the following:

Boolean[] toWrite = { true };
Variant[] toWrite2 = { new Variant(true) };
Boolean[,] toWrite3 = { { true } };

And unfortunately I get the same error. It's possible to write single values by using ua Expert, so I am sure that the server allows writing single values. 

I have been able to subscribe to the properties and read them, but not write to them. Any help would be greatly appreciated!