from onepocket.org rules
.1 Cue ball fouls only: When a referee is not presiding over the match, One Pocket may be played whereby disturbing a single object ball is not a foul, as long as there is no effect on the shot. For clarification, it is always a foul to disturb the cue ball, and it is also a foul if a disturbed ball has any effect on the shot; meaning if the disturbed ball has contact with any ball in motion, or if any ball passes through where the disturbed ball originated. It is always a foul when two or more balls are disturbed. When multiple (3 or more) balls are disturbed it is considered a serious foul. ref: 6.6.2 Serious fouls
6.1.1 Restoring a position: There is no restoration option when any disturbed ball has had an effect upon the shot; in that case the balls must be played from where they lie. Once it is acknowledged that a ball or more was disturbed with no effect on the shot, then the opponent must be given the option to restore the position or leave the balls as they lie before play is resumed. If the opponent elects restoration, it shall be as near as possible to the original positioning according to both players, with the opponent responsible for final approval. It is a foul upon the shooter to restore a ball without permission from the opponent. However, if the shooter was notified, yet resumes play without the opponent’s consent to the final disposition of a disturbed ball, then it is a breach of the restoration
option, and a serious foul on the shooter. ref: 6.6.2 Serious fouls