Check the following items in order:

    Confirm the existing post date of the transactions are in an open fiscal period
    1. If they are not, temporarily update the post dates in the batch to be in an open fiscal period
    2. Save the batch
    3. Open the soft closed fiscal period
    4. Open the batch again
    5. Globally change the post date of the transactions in the batch to correct post date
    OR
    1. Export the batch to excel
    2. Open the soft closed fiscal period
    3. Import the transactions as a new batch

    If Importing the transactions, ensure the post date is a mapped field on the Fields tab.
    1. In Administration > Import > open the import parameter
    2. Select the fields tab
    3. Click to highlight the row for post date
    4. Double click on Post Date on the left to map it to the row on the right
    5. Proceed with mapping the other fields or validating the import