Hi traceyzed
Sorry to see that no one has replied to you yet. The due date on the To Do List, is not based on the Supplier Terms, but the Terms selected at the time of the Purchase.
If you have a look at the purchase it has the date of 30/09, and the Terms of 0% 1st Net 30th after EOM, which means it will be 30 days after September, so 30/10 would be the correct calculation.
If you want to change the due date you can click into the blue arrow and change it to 21 days later.
If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.