def by_site_source_id(self,site_source_id: str) -> SiteSourceItemRequestBuilder:
        """
        Provides operations to manage the siteSources property of the microsoft.graph.security.ediscoveryCustodian entity.
        param site_source_id: The unique identifier of siteSource
        Returns: SiteSourceItemRequestBuilder
        """
        if site_source_id is None:
            raise TypeError("site_source_id cannot be null.")
        from .item.site_source_item_request_builder import SiteSourceItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["siteSource%2Did"] = site_source_id
        return SiteSourceItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the siteSources property of the microsoft.graph.security.ediscoveryCustodian entity.
        param site_source_id: The unique identifier of siteSource
        Returns: SiteSourceItemRequestBuilder
        
msgraph/generated/security/cases/ediscovery_cases/item/custodians/item/site_sources/site_sources_request_builder.py