Resolution:

The programs accessing the files should be changed so that they define the files as variable length record files.

It is not possible to have sequence number checking on line sequential files.

If sequence number checking is required, the file must contain a file header. Fixed length indexed, sequential and relative files should be converted to variable length record format.

Alternatively, if sequence number checking is not required for this file, this message can be avoided by explicitly turning sequence number checking off using the /o s option in this file's entry in the database reference file. See the section Database Reference File Maintenance in the chapter Database Integrity for more details.