Disallowance shown at wrong place in ITR 6

anoop (g.m accounts) (214 Points)

26 October 2019  
In the AY 2018-19 we had shown some disallowance under wrong section which is not matching with Tax Audit report hence in the order 143(1) of Cpc they had disallowed the same again as per tax audit and have raised demand. I believe that now revised return cannot be filed for AY 18-19. please inform what option available to correct it and reduce demand