Buttons disabled when launching a process from the outside (POST)

[J.M.]

Hi,
I have launched the process with a POST request sent from a sensor to a RMP CAPI which uses a connector to trigger a more complex process in TEST mode. This process is triggered fine, however, when it arrives to a manual task, I see that the buttons in my WI's are disbled. Besides, I have noticed too, that if I launch the composite API manually (deleting some initial parameters which are not sent due to the lack of sensor in this case), the process is launched fine too, but the buttons of the following WI's appear enabled, and work fine.
I have watched what is happening, but I don't know why neither how to solve it.

I would appreciate some help, please.

Thanks in advance and regards.