A slave requirement is a requirement whose text property is a read-only copy of the text property of a master requirement. The text property of the slave requirement is constrained to be the same as the text property of the related master requirement.

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Webel has suggested primary/replica as an alternative to master/slave terminology for the SysML Copy relationship in future SysML versions
The Copy relationship
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Dependency::supplier
Dependency::client
SysML keywords
AbstractRequirement
Requirement
Copy
AbstractRequirement::/master
AbstractRequirement::text
Keywords
Since the concept of requirements reuse is very important in many applications, SysML introduces the concept of a slave requirement.
Full quote
A slave requirement is a requirement whose text property is a read-only copy of the text property of a master requirement. The text property of the slave requirement is constrained to be the same as the text property of the related master requirement.
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The master/slave relationship is indicated by the use of the copy relationship.
Webel has suggested primary/replica as an alternative to master/slave terminology for the SysML Copy relationship in future SysML versions
Related snippets
The use of namespace containment to specify requirements hierarchies precludes reusing requirements in different contexts since a given model element can only exist in one namespace.
A Copy relationship is a dependency between a supplier requirement and a client requirement that specifies that the text of the client requirement is a read-only copy of the text of the supplier requirement.
A Copy dependency created between two requirements maintains a master/slave relationship between the two elements for the purpose of requirements re-use in different contexts
When a Copy dependency exists between two requirements, the requirement text of the client requirement is a read-only copy of the requirement text of the requirement at the supplier end of the dependency.
Copy::1_source_and_taget_are_requirements A Copy dependency may only be created between two NamedElements that have a subtype of the abstractRequirement stereotype applied
Copy::2_same_text The text property of the client requirement is constrained to be a read-only copy of the text property of the supplier requirement and this applies recursively to all subrequirements
Since the concept of requirements reuse is very important in many applications, SysML introduces the concept of a slave requirement.
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