Hi KNoel,
If the retrieved batch with the incorrect fiscal period has not yet been posted, you can copy it to a new batch, which includes setting the correct period and 'moving' the original batch with the wrong period, which essentially deletes it.
If the retrieved batch with the wrong period has been posted, then indeed the Unpost Batch function is appropriate in this case. depending on your audit trail requirements, you can delete the details of the originally posted batch, or create a new batch that nets to original posted values to zero, then you post a new batch for the correct details.
Here is a
short video on how Unpost batches works. It needs to be enabled in the Company Profile in order to use it.