@Zdeněk Kabátek, I believe that the best path to be taken is running a loop with a collection that has the names of the fields to be deleted, even for the flow to be cleaner, imagine a scenario where it will need to delete 15 or more fields...
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Emerson Ferreira
Sr Business Analyst
Avanade Brasil
+55 (081) 98886-9544
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Sr Cons at Avanade Brazil