Two At The Same Time ?

[Bandit]

Where, if at all, does the rule book say two fielders may not have possesion of the ball at the same time? Willing to know all associations but really interested in ASA ruling..... Bases loaded, 0 outs, ball hit to pitcher, pither runs into the plate and attempts to "hand" the ball to the catcher who is standing on the plate. Runner touches plate and as pitcher pulls her hand from the catchers glove the ballis still in her possesion. Please note: 10 & Under age group. What's the call?