Sales Order not generating the order due to Configured item number generation error

Summary:

I am creating a Sales Order for a configured Model item and get the following error:

An error occurred because a configure item number generation method was not defined for the item class

I reviewed our Item Class setups for this item (this item was made in an item class that wasn't the root) and the generation method is set to Inherited. In the Root Item Class, the Configured Item Generation Method is set to None. I'm not sure what else needs to be set up

Root Item Class:

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):