When was this job first created, what build of 5.30? If it was 5.30.00, then the line number ID, saved in the input file was not correct. This has been fixed, but there is no way to correct the line number ID.
There is a work-around: export the model to a CAESAR II neutral file, then import the neutral file into a new job. You should be able to set the line numbers after this.
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Regards,
Richard Ay - Consultant