Relationship to the PM's Routes records, used to find the Route records for a given PM. (routes.route = pm.route). The resulting set will contain zero or one record.
Razmerje do zapisov poti za PV, ki se uporablja za iskanje zapisov poti za dano PV. (routes.route = pm.route). Nabor rezultatov bo vseboval nič zapisov ali enega samega.