the messages are with ReferenceNumber ==0 (se picture)

how does the composer concat the correct parts in this case?
Thanks!
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_client.Submit(builder.Create(EncodingMapper.Default));
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var parts = builder.Create(_client);
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_client.Submit(builder);
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var parts = builder.Create(_client);
IList<SubmitSmResp> resp = await _client.Submit(builder);