====== P4-REQ-21-4-010 ======

[[dido:99_annexes:annex-d-requirements:part-04:start| Return to Requirements]]

===== Statement =====

The Phase 0 Implementation Profile / PSM SHALL allow more than one implementation artefact to realise one FX logical Node when the mapping records that choice.

===== Source =====

Part 4, Section 21.4: Logical Node Mapping Requirements.

===== Rationale =====

An FX logical Node may require more than one implementation artefact to realize its responsibilities in the selected Phase 0 implementation context.

Allowing this mapping preserves implementation flexibility while ensuring that distributed implementation responsibility remains traceable to a single authoritative logical Node definition.

===== Applies To =====

This requirement applies to:

  * FX logical Nodes;
  * implementation node artefacts;
  * distributed implementation mappings;
  * supporting modules; and
  * node traceability records.

===== Verification =====

Verification SHALL confirm that multiple implementation artefacts may realize one FX logical Node when the mapping is explicitly recorded.

Verification activities should include review checks confirming that:

  * every contributing implementation artefact is identified;
  * allocated Node responsibilities are documented;
  * all applicable artefacts trace to the same authoritative Node definition; and
  * implementation decomposition does not create conflicting logical Node definitions.

===== Traceability =====

This requirement preserves the distinction between a logical Node definition and the number of implementation artefacts used to realize it.

Related requirement identifiers:

  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-003]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-009]]
  * [[dido:99_annexes:annex-d-requirements:part-04:p4-req-21-4-011]]

Related source section:

  * [[fxdemo:04-part:21-phase-0-implementation-requirements:21-4-logical-node-mapping-requirements:start]]

===== Status =====

Draft

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