E.18.NET:4.6 - Record the network without replacing it

When the selected answer must survive beyond the immediate work, describe it with a separate C.2.1 episteme:

TransformationFlowStructureNetworkRecord@Context <: U.Episteme:
  entityOfConcernRef: one exact TransformationFlowStructureNetwork ref
  entityOfConcernKindRef: TransformationFlowStructureNetwork
  claimScope?: U.ClaimScope
  effectiveReferenceScheme: U.ReferenceScheme
  directMemberRows[]:
    memberRef: TransformationFlowStructureRef | TransformationFlowStructureNetworkRef
  exposedFlowPositionRows[]:
    exposedFlowPositionRef: ExposedFlowPositionRef
    memberPath[]
    leafTransformationFlowStructureRef
    leafFlowPositionRef
  crossFlowRelationRows[]:
    exactRelationOccurrenceRef: U.RelationRef
    exactRelationKindRef: U.KindRef
    subjectPatternLocator: U.EntityRef, locating the pattern that defines or tests this relation
    relationFunctionClaimRef?: U.EntityRef, referencing the exact defining or constraining ClaimGraph when the recorded use depends on that rule identity
    endpointRows[]:
      relationParticipantPositionRef
      memberRef
      flowPositionRef: FlowPositionRef | ExposedFlowPositionRef
      positionBindingRef
  architectureCorrespondenceRowRefs[]?: C.32.CONWAY episteme refs
  selectedNetworkConstraintRefs[]
  networkUseFrame
  preservedNetworkStructure
  lostOrHiddenNetworkStructure
  returnCondition

The record describes the network; it is not the network. Its member and relation rows cite objects that already exist and occurrences that already obtain. An architecture-correspondence row is a qualified reading only. It contributes no member or selected cross-flow relation unless an exact separately grounded relation occurrence and endpoint bindings also satisfy the network identity.

E.18.NET defines this composite locator for one nested cross-flow row:

NetworkCrossFlowRelationRowRef := <
  transformationFlowStructureNetworkRecordRef: U.EpistemeRef, referencing one exact current TransformationFlowStructureNetworkRecord@Context edition,
  exactRelationOccurrenceRef: U.RelationRef,
  orderedEndpointBindingIdentity[]: <
    relationParticipantPositionRef,
    memberRef,
    flowPositionRef: FlowPositionRef | ExposedFlowPositionRef,
    positionBindingRef
  >
>

Resolve the record ref first, then match crossFlowRelationRows[] by the exact occurrence ref and the complete ordered endpoint-binding identity. Exactly one row must match. Zero matches or several matches leave the locator unresolved and stop that consumer; never fall back to the containing record, the occurrence alone, or a prose pointer. NetworkCrossFlowRelationRowRef is a reference shape, not a U-kind, episteme, or relation occurrence. Its U.EpistemeRef targets the containing record, never the nested row.