Empty Array in Structure is also Structure

Hi!
I have problem, when i need to add empty array in structure.

In c# i use next code:

GXArray array = new GXArray()
{
new GXStructure()
{
new GXStructure()
{
new GXEnum(0),
null
},
new GXArray()
}
}

And after use method Write for GXDLMSClient i have next data:
01 01 02 02 02 02 16 00 00 02 00

My GXArray is GXStructure. Why is it? How to put empty array to request?
I need requset with next data:
01 01 02 02 02 02 16 00 00 01 00