Hi Eva,
Move all the transactions to a new batch, setting the date and period to the period you want to post them in. If there are transactions that you don't want posted to a specific period, the move those transactions into another batch. If there are transactions that should be posted to the prior year, then move them into another batch, archive it, then post it to the prior year using that function. You'll also want to post those transactions into the backup made before doing the year end.
There is an option in the company profile to post a batch with errors (normally a batch with errors will not post any transactions). The error transactions will be written to an error batch where they can be edited to deleted.
It's not clear from your post what "didn't work". As I said, we know that posting "works" in Adagio Ledger.
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Andrew Bates