A non-fiscalized order can be fiscalized later in the History within the EET 2.0 sales registration. Additional fiscalization is possible if the order was issued as non-fiscalized due to an error, e.g. in the internet connection.
How do I fiscalize an order later?
In the History, select the non-fiscalized order and tap the Retry button on the left.
Or open the Order options menu and select FISCALIZE RECEIPT.
