code: def _delete_service_nwk(self, tenant_id, tenant_name, direc):
          
          net_dict = {}
          if direc == 'in':
              seg, vlan = self.get_in_seg_vlan(tenant_id)
              net_dict['part_name'] = None
          else:
              seg, vlan = self.get_out_seg_vlan(tenant_id)
              net_dict['part_name'] = fw_const.SERV_PART_NAME
          net_dict['segmentation_id'] = seg
          net_dict['vlan'] = vlan
          net = utils.Dict2Obj(net_dict)
          ret = True
          try:
              self.dcnm_obj.delete_service_network(tenant_name, net)
          except dexc.DfaClientRequestFailed:
              LOG.error("Failed to delete network in DCNM %s", direc)
              ret = False
          return ret
docs: Function to delete the service in network in DCNM.