Let me provide some details as to why both reports are showing differently, Khuram.
A Vendor Balance Details report will only show your unpaid bills and the total amount you owe each. On the other hand, the Transaction List by Supplier provides a list of all transactions associated with a vendor, including journal entries. That is one of the reasons why the Vendor Balance Detail doesn't reflect the 3,500,000 rupees and shows a different amount.
You can choose to run other supplier or vendor reports that provide the right data for your business. Check out this article so you'll know the reports that are included in your subscription: Reports Included in your QuickBooks Online Subscription.
Additionally, create custom reports in QuickBooks using modern view. Consider reading this article for more details: Customise Reports in QuickBooks Online Using Modern View.
If you need further assistance with running reports or any other concerns vendor, post your comment below so we can get back to you. Have a great day ahead for the rest of the day!
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