Fix access to variables in automation chains when using the "this" keyword

In Studio, create the following chain:

- Seam.GetCurrentDocument
- Document.CopySchema:
    schema: dublincore
    sourceId: "@{This.domain.id}"
    sourcePath: "@{This.workspace.path}"

• Associate it to a user action
• Deploy and launch

=> an error is thrown because the variable can't be accessed.
=> this error does not appear when using the "document" keyword instead.