What does 5.4.2.3 require?

The supplier defines and documents, alongside the physical architecture, the hierarchy of the system elements and the sequence in which they are assembled.

ECSS-E-ST-10C System Engineering General Requirements...

Other controls in Clause 5.4: Design and configuration – ECSS-E-ST-10C System Engineering General Requirements (2009 edition)

5.4.1.1 Establish a whole-life system design from architecture, allocation and technology
5.4.1.2 Define, apportion and control technical budgets under the margin policy
5.4.1.3 Define, validate and maintain design methods, tools and models with an agreed coordinate system
5.4.1.4 Maintain the design definition file, the design justification file and the user manual
5.4.2.1 Define the complete configuration at every level and document it
5.4.2.2 Establish configuration baselines at defined milestones

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The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.

MCP endpoint All ECSS-E-ST-10C System Engineering General Requirements (2009 edition) controls