It seems I can not edit my own issue. I meant to say that the ValueRank attribute of MultiStateValueDiscreteType is -2, not -1.

This issue was initially discussed here: https://github.com/open62541/open62541/issues/3826

The problem occures, when implementing the PADIM companion specification

MultiStateValueDiscreteType (ns=0;i=11238, ValueRank=-2[ANY]) --HasSubtype-->MultiStateDictionaryEntryDiscreteBaseType (ns=0;i=19077, ValueRank=-1[SCALAR]) --HasSubtype-->MultiStateDiscreteSignalVariableType(ns=PADIM;i1142, ValueRank=-2[ANY])

According to https://reference.opcfoundation.org/v104/Core/docs/Part3/6.2.7/ either MultiStateDictionaryEntryDiscreteBaseType should be ValueRank=-2, or MultiStateDiscreteSignalVariableType should have ValueRank=-1

Either PA-DIM needs to change to ValueRank = -1, or Part 19 needs to change to ValueRank=-2. Not sure which makes sense.

During the August 27, 2019 TWG review of the Part 19 draft the ValueRank of the MultiStateDictionaryEntryDiscreteBaseType was changed to a Scalar.
During this review it was noted that since it is a subtype of MultiStateValueDiscreteType (defined in Part 8) which has a ValueRank of Scalar then it also needs to be Scalar.
Reference to meeting recording is https://youtu.be/_pT2ka45LyE start listening at 1:52:00.

I suggest we advise FCG that the PA-DIM spec needs to be updated.

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Agreed to change specs to match nodeset (that has always been "any" since 1.03). Affects Part 8 and Part 19. Need Errata for 1.03 and 1.04.
Nodeset also needs to be changed (1.04) for MultistateDictionaryEntryDiscreteBaseType and MultistateDictionaryEntryDiscreteType from Scalar to Any.

MultiStateDictionaryEntryDiscreteBaseType.ValueRank now Any.

Errata created. NodeSet Updated.

Agreed to 1.04 Errata and nodeset change.