INCF/neuroshapes

Hello. I try to implement this hierarchical schema SoftwareFeatureCategory:

{
    "@context": [
        "https://nexus-int.humanbrainproject.org/v0/contexts/neurosciencegraph/core/schema/v0.1.0",
        {
            "this": "https://nexus-int.humanbrainproject.org/v0/schemas/neurosciencegraph/software/softwarefeaturecategory/v0.1.1/shapes/"
        },
        "https://nexus-int.humanbrainproject.org/v0/contexts/nexus/core/resource/v0.3.0"
    ],
    "@id": "https://nexus-int.humanbrainproject.org/v0/schemas/softwarecatalog/software/softwarefeaturecategory/v0.1.1",
    "@type": "nxv:Schema",
    "imports": [
        "https://nexus-int.humanbrainproject.org/v0/schemas/neurosciencegraph/commons/entity/v1.0.0"
    ],
    "shapes": [
        {
            "@id": "this:SoftwareFeatureCategoryShape",
            "@type": "sh:NodeShape",
            "and": [
                {
                    "comment": "The following properties are provided by EntityShape: schema:name, schema:description, nsg:providerId, schema:citation, schema:license, schema:dateCreated, prov:wasRevisionOf, prov:wasDerivedFrom, prov:wasAttributedTo, schema:image, schema:distribution, schema:identifier",
                    "node": "https://nexus-int.humanbrainproject.org/v0/schemas/neurosciencegraph/commons/entity/v1.0.0/shapes/EntityShape"
                },
                {
                    "property": [
                        {
                            "comment": "reference to nsg:SoftwareFeature, nsg:SoftwareFeatureCategory or external feature (e.g. https://www.wikidata.org/wiki/Q192869)",
                            "description": "reference to a specific feature of this featurecategory.",
                            "name": "Feature Instances",
                            "nodeKind": "sh:IRI",
                            "path": "schema:feature"
                        }
                    ]
                }
            ],
            "label": "This shape represents a softwarefeaturecategory a softwarefeature can belong to",
            "nodekind": "sh:BlankNodeOrIRI",
            "targetClass": "nsg:SoftwareFeatureCategory"
        }
    ],
    "nxv:rev": 2,
    "nxv:published": true,
    "nxv:deprecated": false,
    "links": {
        "@context": "https://nexus-int.humanbrainproject.org/v0/contexts/nexus/core/links/v0.2.0",
        "self": "https://nexus-int.humanbrainproject.org/v0/schemas/softwarecatalog/software/softwarefeaturecategory/v0.1.1"
    }
}

where schema:feature could be an external link, another schema or again a SoftwareFeatureCategory.

Now, if i try to add a SFCategory to another SFCategorys schema:feature i get the following error:

{
    "violations": [
        "Error: Violation Error(<http://www.w3.org/ns/shacl#ShapesFailed>). Node(<https://nexus-int.humanbrainproject.org/v0/data/softwarecatalog/software/softwarefeaturecategory/v0.1.1/913c4fa1-1cd3-42f1-92b9-f46334573747>) Failed property shapes Node: <https://nexus-int.humanbrainproject.org/v0/data/softwarecatalog/software/softwarefeaturecategory/v0.1.1/913c4fa1-1cd3-42f1-92b9-f46334573747>, Constraint: <https://nexus-int.humanbrainproject.org/v0/schemas/neurosciencegraph/commons/entity/v1.0.0/shapes/EntityShape>, path: PredicatePath(<>)",
        "Error: Violation Error(<http://www.w3.org/ns/shacl#minCountError>). Node(<https://nexus-int.humanbrainproject.org/v0/data/softwarecatalog/software/softwarefeaturecategory/v0.1.1/913c4fa1-1cd3-42f1-92b9-f46334573747>) MinCount violation. Expected 1, obtained: 0 Node: <https://nexus-int.humanbrainproject.org/v0/data/softwarecatalog/software/softwarefeaturecategory/v0.1.1/913c4fa1-1cd3-42f1-92b9-f46334573747>, Constraint: _:2ff36fbb92c2e9f5db34379bd3a87561, path: PredicatePath(<http://schema.org/name>)"
    ],
    "code": "ShapeConstraintViolations",
    "@context": "https://nexus-int.humanbrainproject.org/v0/contexts/nexus/core/error/v0.1.0"
}

Is a hierarchical structure not supported in v0?
Thanks for your help!