The Copy Tolerance parameter lets you specify a percentage of tolerance between the length of the file layout and that of the copybook describing it. If you set this parameter to 0 (zero), these length values must coincide. Setting a tolerance to a value different from zero may be useful when ‘FILLER’ fields involving the use of a copy layout longer than the file layout are used in the copies. It is a 2-digit numeric value, padded with zeroes at the left.