Go to batch mode and delete there. Ctrl + W is used to switch between batch and interactive input. Delete as much as you can in interactive, then switch to batch and clean up the rest. This image may help- I pointed out the 1 and 2 to show that there may be multiple "pages" for this input and you need to click each one to see the input, shown is page 2. There is a delete button in lower left (but Ctrl + D does the job quicker) Just start at the top of the code/amount/description list and hit Ctrl + D repeatedly until ALL GONE. Then click the 1, 2 or whatever in lower left go to the next "sheet" and repeat.