by mthadm » Sat Jun 13, 2009 5:20 pm
Inverse sign on the amount field, i.e. if you had a deposit of $20, putting minus sign in front of 20 so it becomes -20 will flip the transaction type into withdrawal
This is also true for splits and transfers, i.e. inverting sign on a transfer amount causes it to be counted as a debit or credit based on amount signage.