My case :

I got some document types with the same property (title). I want to put that property in a parent document instead for that thoses childs documents inherits the parent property (title).

Reproduction steps :

1. Create a document type with a textString property with alias : Titre
2. Save
3. Create a child document type with a textString property with alias : title
4. Save
5. Remove the title property from the child document type
6. Save
7. Change the Titre alias to title.
8. Save

You will get the error : Validation: Duplicate property aliases not allowed between compositions.

What the result expected :

I expect to be able to rename the parent property since that property no longer exist in child documents.