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Since a requirement usage is a kind of constraint usage, any nested composite requirement usage is automatically considered to be a required constraint of the containing requirement definition or usage.

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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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A requirement definition or usage may be decomposed into nested requirement usages, which may themselves be further decomposed.
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Since a requirement usage is a kind of constraint usage, any nested composite requirement usage is automatically considered to be a required constraint of the containing requirement definition or usage.
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A requirement definition or usage may also reference another requirement usage as a required constraint.
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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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For the overall requirement to then be satisfied, all such composite or referenced requirements must be satisfied.
For the overall requirement to then be satisfied, all such composite ... requirements must be satisfied.
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