I think the problem was the wrong object "initialization" (file service.js - this.getDatasetEmptyStructure function).
The parameter "is_pub_available" was set with a value like "--".
So check function didn't find this field empty and the API call start without an error message.
Server response in this case is "Bag request" because this field must has BOOL and not STRING.
I changed "is_reviewed" parameter also, this was set to false now is empty like others.
I think the problem was the wrong object "initialization" (file service.js - this.getDatasetEmptyStructure function). The parameter "is_pub_available" was set with a value like "--". So check function didn't find this field empty and the API call start without an error message. Server response in this case is "Bag request" because this field must has BOOL and not STRING.
I changed "is_reviewed" parameter also, this was set to false now is empty like others.