GXDLMSObject 'invalid' description

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GXDLMSObject 'invalid' description

I want to read the description of all my GXDLMSObjectCollection objects. I call the function
"(GXDLMSObjectCollection).save(final OutputStream stream, final GXXmlWriterSettings settings)"
and creates the XML correctly but the function (GXDLMSObject).getDescription always return the String "Invalid" in ALL objects. Please, can you help me?

Best regards.