1a is when you are not providing form 8949 details for the trades which is perfectly ok as long as the sales prices and costs reported to the IRS are correct and there are no adjustments
box 1b is when you are reporting details on form 8949 to the IRS
for then to flow to 1a box 18a on worksheet must be an M and 18b must be $0 for each trade
to have the details reported remove the M and $0 for each trade.
the same is true for 8a and 8b
