This configuration variable allows you to open an indexed file without specifying all of that file's alternate keys. When it is set to 1 (on, true, yes), you may open an indexed file that contains more keys than are described by your program, and no file error will occur. However, you will still receive a file error if you open a file that does not contain all of the keys described in your program. EXTRA_KEYS_OK is useful when you are adding new alternate keys to an existing file because you do not need to rework your existing programs. This configuration variable is ignored if you use a Version 1.4 or earlier ACUCOBOL-85 object file.
The default value is 0 (off, false, no).