Hi @Rogerio_Alves
I wonder how you come to get duplicate data. The DI Studio Append Transformation (at least in my version 4.9) always deletes the output table before appending (check the transformation code in properties -> code), so it should be impossible to get duplicates unless your output table is input to a step before the append, so existing data goes into the appendtogether with new data.
It is a little bit difficult to imagine what's going on, so please post a screenshot of your job canvas.
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