It's tedious but if you go into the customer account activity page, click on each of the outstanding transactions in turn. If they have previously been matched against a payment, you will see a row that says "cancel".

Hi Anita,

Thank you but I need to know specifically what was ‘cancel’ how to find these payments which was cancelled? 

OK, well the same still applies. Both the invoice and the payment will have a line that says Cancel. Alternatively, you can go to the Transactions screen, filter it so you are only looking at Transaction Types SA and Edited On after the date you specify. Scroll over to the right of the screen to the columns Edited By and Edited On. This won't give you an exact answer but will show all transactions that have been altered so it's just a case of wading through them. If you do have 

OK, well the same still applies. Both the invoice and the payment will have a line that says Cancel. Alternatively, you can go to the Transactions screen, filter it so you are only looking at Transaction Types SA and Edited On after the date you specify. Scroll over to the right of the screen to the columns Edited By and Edited On. This won't give you an exact answer but will show all transactions that have been altered so it's just a case of wading through them. If you do have