This check box is used by the return to zero utility for the movements, which is used to re-zero the movements in a folder (which is used to guard the "fixed" data - products, business partners, accounts, BOMs.... -arising from an entry deleting the movements, documents, invoices, stock movements, WO... - linked by example to a test of a real startup). When this box is checked, the re-zero utility erases all the lines in the table. One of these flags is found in each field (when a field must be reset to zero without the table being emptied).