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* '''New Columns can not be added between the original columns in the file''';:
** It is possible to add column to the end of the file;
* '''Columns names can not be changed in the file header''';:
** Column names can be changed in the [[Input Data Format]] step, but objects that already use this column will keep the previous name.
** To update, remove and add again the column to the object;
* '''Columns can not be removed from the file''';* '''Columns must maintain its original order in the file''';* '''Columns data type can not be changed''';