Hello, @Muhammad Imad.

Let me share some information on how QuickBooks handles your multicurrency transactions.

Just to clarify, did you perhaps manually entered your own conversion rate in the system? When you use the multicurrency feature in QuickBooks, the system utilizes the most recent exchange rates from Markit. Also, the value is based on the day you created the Transfer transaction.

You can generate the Transaction Detail by Account report. It displays all of your transactions specific to your GBP and PKR account. This way, we can review all the transactions that cause a negative balance. Here's how:

1. Go to the Report menu.
2. Scroll down to the For my Accountant section.
3. Double-click on the Transaction Detail by Account report. 

Get back to us here if you have other questions about using the multicurrency feature in QuickBooks. I'm always here to help.