When unmarking the Do not acknowledge checkbox on a posted payment via revenue update batch, the exception "Adjustment reason is required" is thrown. If this change is made using the Edit posted payment form, an adjustment is not required. This issue appears to happen only if the revenue application has been adjusted previously. For example, the transaction was entered as a donation > posted > application was changed to an event registration > posted.
We are currently evaluating this issue for a fix in a future service pack.
Steps to Duplicate
1. Add a donation and mark it "Do not acknowledge" > Posted the transaction to the GL 2. Edit the posted payment to change the application to an event registration > Post the adjustment to the GL 3. In a revenue update batch, unmark the "Do not acknowledge" checkbox > Validate the batch > Notice the exception "Adjustment reason is required".