Dynamic folder not associated with an entity type?

I'm trying to get the Shotgun schema to match our current folder structure, and I'm running into a bit of an issue.

We've got multiple shows we are producing, and a lot of the folders contain the show's three letter initials after the folder name. For example: Maya_AAA

I'm currently doing testing with our asset pipeline, so these are the examples that I'll be using.

The asset_work_area_maya in templates looks something like this:

asset_work_area_maya: 'Maya_{initials}/scenes/{sg_asset_type}/{sg_initials}/{Asset}/{Step}/WIP'

Our folder structure looks like this:

-ABC

    --Maya_ABC

        --scenes

            ---asset_type (Character, Prop, etc.)

                ----sg_initials (A, B, C, etc.)

                    -----asset (ChairA)

        --sequences

        --sourceimages

        --etc.

I've got everything else figured out, except for getting those initials after Maya to show up. I've managed to get it to work if I make the folder dynamic with the following:

type: "shotgun_entity"
entity_type: "Asset"
name: "Maya_{project.Project.sg_initials}"
filters:
- { "path": "project", "relation": "is", "values": [ "$project" ] }

This works, except when I try to create folders for a new asset I get the (expected) warning of:

ERROR: The path is already associated with Shotgun Asset.

How should I go about getting this to work? Please let me know if you need any further information.