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Subrequirements are considered to automatically be required constraints of the containing requirement definition or usage. This is useful for modeling groups of requirements that are intended to be satisfied together on the same subject.

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SysMLv2: Cameo: LIMITATION: Does not list requirement usages (subrequirements) that are owned under the assert constraints compartment.
Requirements Examples: HSUVRequirements.sysml
Requirements Examples: RequirementDerivationExample.sysml
Requirements Examples: VehicleRequirementDerivation.sysml
Source
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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A composite requirement usage nested in a requirement definition or usage is a subrequirement of the containing requirement definition or usage.
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Subrequirements are considered to automatically be required constraints of the containing requirement definition or usage. This is useful for modeling groups of requirements that are intended to be satisfied together on the same subject.
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To simplify doing this, if a subject parameter is not explicitly declared for a subrequirement, it is assumed to have the same subject as its containing requirement definition or usage, with its subject bound to that of the container.
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