Artifact: Subsystem Supplementary Requirements
This is essentially the Supplementary Specifications artifact one level down. It has to be a separate artifact because it has a different responsible role (at this level). Otherwise, it has the same purpose and content: it becomes the Supplementary Specifications for the application of RUP to the development of the subsystem.
Domain:  Systems Engineering
Work Product Kinds:  Specification
Purpose

The following roles and role sets use the Supplementary Specifications:

Relationships
Tailoring
Representation OptionsUML Representation:

The kinds of supplementary requirements vary widely between projects, so tailoring needs to be applied to define sections applicable to your project.  Decide which information (attributes) to include in the Supplementary Specifications, and which to manage using requirements management tools, such as Rational RequisitePro (see Tool Mentor: Managing Dependencies using Rational RequisitePro®, and also see Work Product: Requirements Attributes).