I am not sure what your question is. You have taken your issue to the IG?
I guess I am confused is the evaluation accurate? If it is I can't see what the issue might be....if its not you don't have to concur...
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you have the ability to appeal, cheak out https://www.hrc.army.mil/TAGD/Evaluation%20Appeals%20and%20Corrections
IG is not the way to go.
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You have the absolute right to appeal the evaluation. If you are successful, the evaluation will be pulled from your personnel record permanently. If you have any questions about the process, feel free to call me. The initial consultation is always free.
I'm unclear what you mean by "erroneously written." If you believe your evaluation was not submitted in a procedurally correct manner, IAW with the applicable reg, and/or you disagree with the ratings/comments in it, you certainly have the right to appeal it, which includes the right to appeal to Army admin boards if necessary: http://arba.army.pentagon.mil/index.cfm. In that event, an attorney could certainly help you with an evaluation appeal.
If you already have an open case with the IG, I'm not aware of any regulation that states your case with them ends if you ETS. You just need to make sure that you coordinate with them beforehand, so they know how to reach you when you're out of the Army. You should specifically ask them if your ETS poses any problem.