Semantic errors in TS29505_Subscription_Data.yaml

[arvindpdmn]

Semantic errors are seen in Rel-16, Rel-17 and Rel-18. I show below the errors for Rel-18. https://jdegre.github.io/editor/?url=https://raw.githubusercontent.com/jdegre/5GC_APIs/Rel-18/TS29505_Subscription_Data.yaml

It's possible that similar errors are there in other YAML but I did not check the other files. Strangely, OpenAPI code generator does not complain about these semantic errors.