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A composite usage must be featured by an occurrence (such as an item, part or action ...)

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SysML2.0: GOTCHA: p.632 subparts : Part [0..*] {subsets subitems}: Does not indicate that subparts is nonunique (has consequences for user model nonunique usages)
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)
SysML2.0: TIP: A part usage or item usage "directly" owned by a package is referential (isComposite=false) not composite (isComposite=true) and even if the ref keyword is omitted because a package is not an occurrence
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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