With Deduct as Sold on, a row whose deduction would push on-hand stock below zero is tagged Negative (status Warning) instead of Apply, and a yellow box says Some rows take stock below zero... They still apply if you continue - matching how manual stock movements already behave - but it usually means the sheet double-counts a day. The rows are not blocked: if you click Apply they are written and the stock goes negative, exactly as a manual Remove Stock movement would. Check the sheet (or the recent-uploads list in the modal, which flags a Same day upload) before confirming if you did not expect negatives.