When the invoice of a customer is overcast the ... - WAEC Accounting 2015 Question

Overcasting is when the estimated value turns out to be above the realized value.

A credit note is a letter sent by the supplier to the customer notifying the customer that he or she has been credited a certain amount due to an error in the original invoice or other reasons. A credit note is issued when a customer pays an amount above the real amount due to an error in the sales invoice that overstated the said amount to be paid.