Some teach that a Chatzer of partners is obligated, and a Chatzer that is not of both of them is exempt.

Some teach that even a Chatzer that is not of both of them is obligated.

The one who teaches that a Chatzer of partners is obligated, and a Chatzer that is not of both of them is exempt, he learns from "Meitiv Sadehu.'' The one who teaches that even a Chatzer that is not of both of them is obligated, he learns from "u'Vi'er b'Sedei Acher'' - in any case.

(R. Yosa citing R. Yochanan): A Chatzer of partners is exempt. (NESIVOS YERUSHALAYIM, HAGAHOS R. DINAR)