What does 5.4.1.4 require?

Those doing the system engineering establishes and keeps current a design definition file, a design justification file and a product user manual, each to its document requirements definition.

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
5.4.2.1 Define the complete configuration at every level and document it
5.4.2.2 Establish configuration baselines at defined milestones
5.4.2.3 Define and document the hierarchy and assembly sequence

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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