$translate returns no results for non-equivalent mappings (wider, narrower, etc.)

[jmandel]

Summary

$translate silently returns "No translations found" for any ConceptMap mapping with a non-equivalent equivalence type (wider, narrower, subsumes, specializes, inexact, relatedto). Only equivalent mappings produce results.

Root cause

In tx/workers/translate.js line ~270, translateUsingGroups checks map.relationship against R4 equivalence names (wider, narrower, subsumes, etc.). But _convertEquivalenceToRelationship in tx/library/conceptmap.js has already converted these to R5 relationship names (source-is-broader-than-target, source-is-narrower-than-target, etc.). Only equivalent matches because it's the same string in both R4 and R5.

Repro

# POST with an inline ConceptMap having wider+narrower equivalences
curl -s -H 'Content-Type: application/fhir+json' -H 'Accept: application/fhir+json' \
  -X POST 'https://tx-dev.fhir.org/r4/ConceptMap/$translate' \
  -d '{"resourceType":"Parameters","parameter":[{"name":"sourceCode","valueCode":"x"},{"name":"sourceSystem","valueUri":"http://example.org/cs1"},{"name":"targetSystem","valueUri":"http://example.org/cs2"},{"name":"tx-resource","resource":{"resourceType":"ConceptMap","url":"http://example.org/cm-test","status":"active","group":[{"source":"http://example.org/cs1","target":"http://example.org/cs2","element":[{"code":"x","target":[{"code":"X1","equivalence":"wider"},{"code":"X2","equivalence":"narrower"}]}]}]}}]}'

Prod (tx.fhir.org): result: true with 2 matches — X1 (Wider) and X2 (Narrower)
Dev (tx-dev.fhir.org): result: false, "No translations found"

Impact

All ConceptMap translations with wider, narrower, subsumes, specializes, inexact, or relatedto equivalences silently produce no results. This affects most real-world clinical mappings (e.g., FHIR-to-v2 contact point use, data absent reason maps).