Each door on the floor plan carries a number. The schedule has one row for that number. The hardware set column points to the door hardware spec section.
Example: a door supplier reads a row for a pair of hollow metal doors with a fire rating. The row names the frame type and the hardware set.
Count the doors on the plans and compare the count to the schedule rows. Doors appear on plans but not in the schedule, and the reverse. Check that the hardware sets in the schedule exist in the spec. Note each mismatch and ask about it.