[Bug] Same Structure Defintion can be registered

[kuma1416]

Describe the bug

After a structure definition was registered, I tried to register same one. FHIR Works allowed it. I don't think FHIR specification allows to register duplicated structure definition because structure definition is uniquely identified by the URL.

To Reproduce Steps to reproduce the behavior:

1. Making a structure definition
2. Registering the structure definition
3. One more

the sample of a structure definition. https://github.com/HealthDataWorks/fhir-ig-jp-eCheckup/blob/main/input-json/resources/StructureDefinition-jp-eCheckup-Observation.json

Expected behavior When I register the structure definition again, FHIR has to say 'an error' because FHIR has already the same structure definition.

Screenshots If applicable, add screenshots to help explain your problem.

Versions (please complete the following information):

• commit 432d4a88e74c4bfec5b0374ee21f592aaebaef02

[SanketD92]

Thank you for creating this bug report. I'll create a ticket in our team's backlog.

[kuma1416]

Thank you for creating a ticket!

[ElliotSilver]

@kuma1416 When you "register the structure definition again" are you saying the id is the same or the canonical url (url element) is the same? I believe canonical urls may be duplicate--actually, duplicate canonicals have to be permitted in order to have multiple versions of the same struct def.

[github-actions[bot]]

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