Attempting to open indexed file whose actual keys do not match
  those declared

  Explanation: The program specified more keys for a file than had
  been defined for that file.

  User Action: You must take the following actions:

      a. Check that the file being specified is the one you intended.

      b. Check the number of keys for the file using the DCL command
         DIRECTORY/FULL.

      c. Use the CONVERT utility to add key definitions to the file.