The negative value of the refund should be excluded from the running total of expenditure for the day. I would prefer to see what I have actually spent in the day as opposed to a sum amount. For example where I have less spending in a day than a refunded amount my expenditure for that day shows 0.00 rather than reflecting my actual outgoings.
Maybe an option for refunds to be manually mapped to the transaction they are for to readjust the spending on that day and not affect a different day’s expenditure.