POS: Void payment doesn't work

Hi all,

We are using two currencies at POS (USD & KHR).

I did setup Voide payment function, system always default payment type "Cash-USD" as below screen shot:

Then when I do transaction, customer paid in KHR first, then changed their mind to pay in USD, I clicked Cancel Payment but system still calculated the amount in KHR in to the bill.

The error is detailed as below:

1. Order Balance 1.60$ or 6560 R
2. Customer give 5000R
3. In POS still show balance 0.38$ or 1558 R
4. Then customer changed mind to cancel 5000R , we return them 5000R then we clicked on Cancel Payment button (5000R should be cancelled)
5. Then balance go back to 1.6$ or 6560R
6. Then customer give us 2$ more to settle 1.60$ balance
7. POS show the bill with the result: change in $0.40 + change in Riel R 5000
   -> The bill has been printed out with total change amount $0.40+ R5000
   

At step 7th, the correct change should be $0.40 only.

Please let me know what was wrong in my setup? How can I solve this?

Thank you