Example: You are editing a table row with some application, but when you try to save the changes, the system discovered that the row has been deleted from the t

Example: You are editing a table row with some application, but when you try to save the changes, the system discovered that the row has been deleted from the table. The business logic does not permit you to create rows arbitrarily, so a new row cannot be inserted instead of updating existing one. The behavior admittedly does not make sense for files (although I suppose you could rename or delete the directory that contains it), but it's sort of unavoidable if you don't want to take locks while some client application you don't control may or may not make changes.