Document Status not changing when document approval procedure in SOLAR01/02

Here is my situation:

We created and assigned a Status Schema for Solution Manager Document and to that status assigned a signature strategy. We have defined the following end results for the signature strategy, when the process is initiated:

FROM TO

Copy_editing -> in_progress

In_progress -> Reviewed

Reviewed -> Released

We initiate the process and the author performs the first signature, so the outcome expected is for the strategy to change the status from copy_editing into in_progress so on and so forth.

This is not happening and the document stays in copy editing throughout the approval process.

Any ideas? I can provide the complete configuration done in order to see if we missed something.