Re: Vendor Bills
The usual reason why there would show an open amount but no overdue amount would be if there is an unapplied payment or credit note.
The easiest way to check this is to click into that supplier and to the right of the word action there is a cog,if you click on that you can see some columns to tick,if you put a tick in the status column and then click the cog again to close that pop up. You should be able to see a transaction for that amount that shows unapplied in the status column. That should be the transaction that is causing the discrepancy.
Let us know how you get on