MIXFILACC

 NUMBER:  31

 ERROR CODE:  F

 MESSAGE TEXT:  mixed file access modes

 EXPLANATION:  One of the following conditions occurred:

  o  An attempt was made to use both formatted and unformatted
     operations on the same unit.

  o  An attempt was made to use an invalid combination of access
     modes on a unit, such as direct and sequential.  The only valid
     combination is sequential and keyed access on a unit opened
     with ACCESS='KEYED'.

  o  An attempt was made to execute a Fortran I/O statement on a
     logical unit that was opened by a program coded in a language
     other than Fortran.