Custom Graphs gets no data from objects with instance index

Hello,

with the MIB Browser i get the following data

(OID .iso.org.dod.internet.private.enterprises.emerson.liebertCorp.liebertUps.luExtensions.luCore.lcUpsOutput.lcUpsOutputTable.lcUpsOutputEntry.lcUpsOutputCurrent)

lcUpsOutputCurrent.1:5
lcUpsOutputCurrent.2:4
lcUpsOutputCurrent.3:5

(OID .iso.org.dod.internet.private.enterprises.emerson.liebertCorp.liebertUps.luExtensions.luCore.lcUpsOutput.lcUpsOutputTable.lcUpsOutputEntry.lcUpsOutputCurrent.1)

lcUpsOutputCurrent.1:5

If i create a Custom Monitor with ...lcUpsOutputCurrent.1 the Custom Graph gets no data, with no instance index it shows the right 3 values!