Hi Irene,
To answer your first question, you can never Unpost from a historical fiscal year but you can 'Post to Prior Year', or the immediate historical year.
However, once the Next Fiscal Year has been created, then the Post to Prior Year function becomes disabled, therefore you cannot post to the historical year.
When you create the Next Fiscal Year with Adagio Ledger version 9.0A or 9.0B, you do not have to close your Current Fiscal Year at the same time. You can keep both years open for as long as you need to complete your Current year. When you are ready, then you can close the year.
If you are using Adagio Ledger 9.0B, you can Unpost from either the Current or Next Fiscal Year if both are open. Older version of Ledger only supported Unpost from the Current fiscal year.
We hope the checklist that Ralph linked to is helpful for you.
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Regards,
Softrak Tech Support