Relationship to the PM's ancestor records, used to find all PMs under this PM in the hierarchy. pm.pmnum in (select pmnum from pmAncestor where Ancestor = :pmnum)). This set includes this PM so it will always have at least one record.
Razmerje do zapisov prednikov za PV, ki se uporablja za iskanje vseh PV-jev pod tem PV-jem v hierarhiji. pm.pmnum in (select pmnum from pmAncestor where Ancestor = :pmnum)). Ta nabor vključuje ta PV, zato bo vedno imel vsaj en zapis.