Missing Property from Referenced Type

[davifantasia]

Originally reported here - https://github.com/commercetools/commercetools-docs/issues/223

We have the same problem in our test RAML where key property is missing in the generated subtype.

KeyReference is defined here:

https://github.com/commercetools/commercetools-docs-kit/blob/6f09f5be28d3a0fe6479b1394c0497a29bc383ef/websites/api-docs-smoke-test/source-raml/test/types/references.raml#L71-L78

ExampleTargetTypeKeyReference is the subtype:

https://github.com/commercetools/commercetools-docs-kit/blob/6f09f5be28d3a0fe6479b1394c0497a29bc383ef/websites/api-docs-smoke-test/source-raml/test/types/references.raml#L89-L93

This is the generated RAML for ExampleTargetTypeKeyReference:

https://github.com/commercetools/commercetools-docs-kit/blob/master/websites/api-docs-smoke-test/src/api-specs/test/types/ExampleTargetTypeKeyReference.raml