Business objects relations

Hi everyone.

I’m having a problem with relations between business objects. Simply put, I have an object “visit” which has a field “patient” that represents a composition relation on another business objects (also called “patient”).
I have a process “p_A” in which a user inserts fields for the “visit” object and, after press the button submit, I expect the process to continue with “step3” but this does not happen. I checked the post request in the browser and all the fields are set correctly (status code 204). If I remove the business object the process proceeds as expected. What could be the problem?

I uploaded a .bos at the following link: https://www.dropbox.com/s/gdfesfrwk4jmto9/p_A-1.0.bos?dl=0

Thanks in advance.
Best

Easily enough, turned out that cleaning the database and restarting Bonita BPM solved the issue.