async def get(self,request_configuration: Optional[RequestConfiguration[CatalogRequestBuilderGetQueryParameters]] = None) -> Optional[AccessPackageCatalog]:
        """
        Catalog of the access package containing this policy. Read-only.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AccessPackageCatalog]
        """
        request_info = self.to_get_request_information(
            request_configuration
        )
        from ........models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from ........models.access_package_catalog import AccessPackageCatalog

        return await self.request_adapter.send_async(request_info, AccessPackageCatalog, error_mapping)

        Catalog of the access package containing this policy. Read-only.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[AccessPackageCatalog]
        
msgraph/generated/identity_governance/entitlement_management/access_packages/item/assignment_policies/item/catalog/catalog_request_builder.py