/sys$common/syshlp/helplib.hlb FORTRAN, Error Messages, Compilation Errors, INVLOGIF  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SEVERITY:  F

  MESSAGE TEXT:  Statement cannot appear in logical IF statement

  EXPLANATION:  A logical IF statement must not contain a DO
  statement or another logical IF, IF THEN, ELSE IF, ELSE, END IF, or
  END statement.