Hi there, @aaaaaab. I want to share some insights about the flow of the A/P Aging report in QuickBooks Online.

There's no standard A/P Aging report that is run using the invoice date. It always uses the due date and is aged based on Days Past Due or Days Until Due. Additionally, it digs deeper into the status of accounts payable and how any debt from overdue payables to vendors may impact future quarters. For this reason, it calculates based on due dates and not the bill or transaction dates.

Alternatively, you can export the report to an Excel file and customise the details from there. Here's how to export:

1. Open the Reports menu.
2. Search for and pick the A/P Aging report.
3. At the top of the report, select the Export icon. Then select Export to Excel.
4. Save the file somewhere you can easily find, like your Downloads folder or your desktop.

Furthermore, you can manually edit the due date and set it the same as the transaction date. This helps report to flow the way you want it to be. Kindly see the image below for reference.

If you're all good and want to handle vendor bills, read this for guidance: Enter and manage bills and bill payments in QuickBooks Online

You can always get back to us if you need more help with reports, bills, or QuickBooks. The Community is here lend a hand to you and your business. Take care!