Hi,
I am using desktop version and seeing different UI then yours. And in 8949, (f) is a code, not an amount field.
I tried below and works for me:
in Form mode, cancelled override for each field.
in Step by Step Mode (1099b):
Box1e: entered Cost Basis from Broker's 1099b
Clicked 'I'll enter additional info on my own' button.
Checked Box 2 Gain or loss is Ordinary
Entered Corrected Basis (amount).
Then in 8949, it auto populates following:
(f): populates code 'B'
(g): populates the correct Amount of Adjustment.
