In VAT return form, the exception Unable to determine nature of adjustment displays the journal vouchers recorded with tax ledger (grouped under Duties & Taxes), without selecting Nature of Adjustment.
To resolve this exception
1. Select the exception Unable to determine nature of adjustment.
2. Press Enter.
3. Click S: Set Details.
4. Select the Type of Duty/Tax from the list.
5. Select the Nature of Adjustment and the applicable Additional Details as shown below:
6. Press Ctrl+A to accept.