Discounts – Revenue

Good day,

Let’s say we’re preparing the FS for the YE 31.12.20X5.
If the amount of revenue discount was recognized incorrectly in 20X5, meaning the amount should’ve been recognized in 20X4 (revenue cut off) (because it refers to 20X4), but instead it was recognized in 20X5, then what would be the JE adj for this?

Should it be just Dr Revenue Cr AR? But then what about the outstanding balance that refers to the PY. I can’t understand the logic here