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I have the same question (0)Hi Greg,
You can open all periods using the Open All Button and post the adjustment entries and close all when done. Technically, there is no difference in opening all periods together and posting all adjustments or opening them one by one and posting adjustment.
The only risk is somebody accidentally posting transactions in these periods while you are entering the adjustments. However, this risk also exists when you are opening each period and posting the transaction. The probability of such thing is very small.
To minimize the risk, you can save all adjustment entries in batch/batches (You can ignore the fiscal period closed warning while saving the transactions). Open all the periods when you are ready to post the transaction. Close the period immediately after posting.
Rubal,