how to get attribute 2 type for GXDLMSData object in python

Hello Mikko,

I have Data class object where attribute 2 is of Structure type, for example.

<Structure>
<UInt8 Value="255" />
<UInt8 Value="255" />
</Structure>

I need to write new value for this attribute.

This sample gives me python type error (something like 'type not set'):

my_object = objects.GXDLMSData( OBIS_name )
old_value = reader.read( my_object, 2 )
value=GXStructure()
value.append(GXUInt8(it[0]))
value.append(GXUInt8(it[1]))
my_object.value = value
reader.write( my_object, 2 )

though it work ok if I add this line:

my_object.setDataType(2, DataType.STRUCTURE)

just after "my_object" creation.

So the question is what shouild I do to read attribute 2 datatype automaticaly from the meter?