Changes

* Is very important to set the right type for each column. When the type is not right, the word NULL will be shown in the cells.

* The Formula columns show the expression used in the spreadsheet or text file.

* You can´t delete existing columns in the data source.

* In value columns, empty cells (NULL) will be converted to "0".

* In date columns, empty cells or not valid dates will be converted to NULL.

* In text columns, empty cells will be converted to NULL.