The smileutil upload-terminology command does not support loading more than one CodeSystem.concept.property value to the TRM_CONCEPT_PROPERTY database table with the same CodeSystem.concept.property.code for a given CodeSystem.concept.

{
  "resourceType" : "CodeSystem",
  "id" : "mycodesystem",
  "url" : "http://example.com/mycodesystem",
  "content" : "complete",
  "concept" : [{
    "code" : "code-a",
    "display" : "Code A",
    "property" : [{
      "code" : "alt_description",
      "valueString" : "code a"
    },{
      "code" : "alt_description",
      "valueString" : "CODE A"
    }]
  }]
}

If the above is loaded through a FHIR endpoint via a POST or PUT request, Smile CDR creates two rows in the TRM_CONCEPT_PROPERTY table.

Alternately, if this same code system is loaded using smileutil upload-terminology, only one row is created.

This is problematic as some ValueSet definitions use concept.property values to define their contents.