Snapshot generator does not expand complex extensions defined in a an extension.

[Rob5045]

The bug was originally submitted to Forge:
https://firely.atlassian.net/browse/FOR-872

The project to reproduce the issue is attached.
The issue is for file: NLLArticleInfoCorrect.xml.

The snapshot generator method Generate returns 2 of the same errors:

https://electronichealth.se/fhir/StructureDefinition/NLLArticleInfo2 (Element Extension.extension.extension has neither a type nor a nameReference.)

They correspond to the extension element definitions for currentProductName and history.
These two element definitions are not expanded.

• FHIR Version: R4
• Version: 5.8.1

swedishnationalmedicationlist(5).zip

[mmsmits]

Don't spend more than 2 days researching what's going on here

[mmsmits]

@MatthijsvdWielen You've had a call about this with @alexzautke , what was the conclusion ?

[MatthijsvdWielen]

@mmsmits that call did not solve the issue unfortunately.

The customer provided some additional information. In version 23 everything was still working and from version 24 the issue started. https://simplifier.net/SwedishNationalMedicationList/NLLMedication/~history

[mmsmits]

I found out the problem. It's not the snapshot generator. But the order of the ElementDefinitions in the differential.

I attached the correct file here:
NLLArticleInfoCorrect.txt

Please note that the order of the elements in a Differential matter a lot.
And Extension.extension comes before Extension.url and Extension.value[x].

I don't if Forge created this (I think not), but the user should be informed.

[mmsmits]

See unit test for this here as well:
https://github.com/FirelyTeam/firely-net-sdk/pull/2877/files