That's what you get for trusting your RO, reading it on his computer, being happy with the recommendation and write up then ticking no comments and moving on.
Why are you reading it on his computer? Your SJAR would have been in your workflow and you have up to 5 days to tick the no comments and moving back to the 1st RO. You therefore had the opportunity to print it off and do a thorough check of the front page which is your one and only opportunity to sell yourself to any promotion board by
1. Checking that the Roles & Responsibilities accurately reflect the job you have been doing.
2. Checking that your Personal Objectives are correct and up to date.
3. Checking your future posting choices are correct.
4. Checking your Future Aspirations are correct.
You could then do a full check of the 1st RO Performance and Potential narrative, checking for any obvious spelling mistakes, and check the promotion recommendations and rank for future employment are correct.
Personally, after completing a 1st RO de-brief, I hand a print of the SJAR to the subject and I ask them to check to ensure there are no mistakes or inaccuracies. At that stage there is still time to rectify. As a 2nd RO, I expect the 1st RO to have carried this out, however, I still print off the SJAR and hand it to the subject as there is still an opportunity to ensure it is correct before it is finalised.
You have been let down by your 1st and 2nd RO's as they have not checked your front cover properly and should have noticed that the date that you set your Personal Objectives were outside of the Reporting period covered.
Ultimately, you have let yourself down by not checking. As an RO with significant experience, I cannot stress enough how important it is to check your SJAR. It is your future promotion and career at stake!