Presumptive income from goods carriage under section 44ae

Sir,   here is problem,  we hv 26as income i.e. 479980/- from Goods Carriage. I hv no proof of expenditures like purchage bills, etc I would like to file itr4 for a.y. 2017-18 with profit of 240000 by fill 44ae section (20000) p.m. but after complete form when i save X M L file , i have message "Please fill all the fields in schedule AL".I havn't income exceeds rs. 50 lakh why i have this msg? Is it correct  section to file above mentioned return?  

plz ans sir