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SysMLv2: A part usage nested in (owned by) an occurrence and declared nonunique must be a referential «ref part» (that subsets the nonunique Parts::parts) not a composite «part» (that subsets the UNIQUE Items::Item::subparts)

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Note kind
CONSTRAINT
MODELLING
TIP
Policy level
INFORMATIVE
Specification keywords
SysMLv2
SysMLv2 keywords
part usage
referential
composite
Feature::isComposite
unique
nonunique
Parts::parts
Items::Item::subparts
occurrence
Keywords
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A part usage nested in (owned by) an occurrence and declared nonunique must be a referential «ref part» (that subsets the nonunique Parts::parts) not a composite «ref part» (that subsets the UNIQUE Items::Item::subparts), otherwise it fails this constraint:

validateSubsettingUniquenessConformanceIf

'If the subsettedFeature of a Subsetting has isUnique = true, then the subsettingFeature must have isUnique = true.'

subsettedFeature.isUnique implies subsettingFeature.isUnique

For a full explanation visit:

SysML2.0: GOTCHA: p.632 subparts : Part [0..*] {subsets subitems}: Does not indicate that subparts is nonunique (has consequences for user model nonunique usages)

Note that this does not apply to part usages owned directly by a package (which is not an occurrence), since such part usages are referential anyway.

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[MODELLING, TIP]{INFORMATIVE} About Webel's "Rich Slides" for SysMLv2 for detailed analysis and advanced topics
[GOTCHA, ISSUE]{EDITORIAL} SysML2.0: GOTCHA: p.632 subparts : Part [0..*] {subsets subitems}: Does not indicate that subparts is nonunique (has consequences for user model nonunique usages)
Related notes (backlinks)
Related snippets (extracts)
  [SysMLv2] A composite usage must be featured by an occurrence (such as an item, part or action ...)
  [SysMLv2] nonunique – If a usage is non-unique, then the same value may appear more than once as a value of the usage. The default is that the usage is unique, meaning that no two values of the usage may be the same.
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