In section https://w3c.github.io/dxwg/dcat/#Property:resource_relation

Sub-properties of dcterms:relation in particular dcat:distribution, dcterms:hasPart, (and its sub-properties dcat:catalog, dcat:dataset, dcat:service ),

the subproperties of dcat:resource are listed as subproperties of dct:hasPart which is correct, but it does not mention the full subproperty hierarchy: namely dcat:resource.