When going to Accounts Payable\Reconciliation\Transactions and clicking the Edit Transaction button to edit the Date Reconciled date, the transaction date changes.
We are currently evaluating this issue for a fix in a future release or patch. In the mean-time the work around is to click into the line directly below and then back up into the line in question and the date will change back.
Steps to Duplicate
1. Go to Accounts Payable\Reconciliation\Transactions 2. Click the Edit Transaction button on the desired transaction make any changes in the window and update the date reconciled 3. Save the change and close the window. 4. See the Transaction Date change from the original value.