Error: CMN.ATO.IITR.310026 – Primary production and/or Non-primary production deferred losses amount required More
A Business loss code of 8 has been entered at Description of activity for Activity 1, 2 or 3, but no amount has been entered at primary production deferred losses and/or non-primary production deferred losses. The sum of net losses associated with Activity 1, 2 or 3 must also be reflected in the deferred non-commercial business losses items. 

Solution: Please enter values  at Deferred Losses section (primary or non-primary income),  as error says if Loss type is 8.