Reading your P&L
Which day does a refund belong to?
The day the refund was issued, for both the revenue and the cost credited back. Not the day the original order was placed.
This is why last month stops changing once it is over. Booking refunds back against the original order is the most common reason a homemade profit report cannot be trusted; the full reasoning is in which day a refund belongs to.
Did this answer it? If not, a person who knows the product will.