format can result from any kind of I/O operation and could be set for these reasons, among others:
The file format (fixed or variable length) is different from the EGL record format.
In relation to fixed-length records, the length of a record in the file is different from the length of the EGL record. In relation to variable-length records, the length of a record in the file is larger than the length of the EGL record.
The file type specified for the record does not match the file type at run time.
The key length in the file is different from the key length in the EGL indexed record.
The key position in the file is different from the key position in the EGL indexed record.
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