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