About refund

[Cyruschan8]

I found the the functionalities of wallacepos are great! And it is very easy to use. But I found it cannot accept negative amount transaction, in our case, we receive money from customer for smart card value add and return money when they return the smart cards, we are unable to process the refund transaction with wallacepos, so I am just see if it is worth to make wallacepos allow negative transaction in the future.