How Do You Handle Mis-Shipments?

Occasionally we have orders that are mis-shipped. Obviously the first step is a root cause analysis to figure out why the error occurred, and a way to prevent it from happening in the future. Short of that, I'm curious what users on RetailOps are doing to reconcile inventory and handle the situation for the customers.

Here's the scenario:

Before error:

QOH SKU1 = 1

QOH SKU2 = 1

1. Customer places order for SKU1

2. Warehouse accidentally ships SKU2

After error:

QOH SKU1 = 1

QOH SKU2 = 0

But RO thinks you have zero of SKU1 and 1 of SKU2, which allows you to take an order for SKU2 that you will not be able to fill.

Additionally, you need to resolve the situation for the customer by placing a new order for the correct product again (but RO thinks you don't have any available).

And how do you deal with the return of SKU2 so that it is a seamless process for your RMA team?

Obviously this could be handled with a lot of manual inventory adjustments, notes, etc. but that is far from a "good" solution.

Thoughts or ideas on how to better handle this when it occurs with the constraints present in the RO platform?