In a scenario where:

Start Remain qty = 4

RAF qty 1 > Remain qty = 4-1 = 3

Report Error qty 2 > Remain qty = 3-2= (Should be equal to 1) but the system treated it as 0 when reversal qty introduced by -1

Based on the parameter Increase remain qty with error qty, it will have the same logic if it's been turned ON or OFF and the qty remaining will be equal to 4 (when it should be 2)

When it's ON: Remain = Remain - good quantity.

When it's OFF: Remain = Remain - good quantity - error quantity.

Reversal:

When it's ON: Remain = Expected - posted - posting.

When it's OFF: Remain = Expected - posted - posting (good + error quantity).