Ah, I understand what you are talking abut now. There are conflicting rules because printed in monster manual III, it says that objects held by creatures with the incorporeal subtype are incorporeal. While in libris mortis the feat says that you can hold objects as if you were corporeal. There is a debate over which rule takes precedence. However according to wizards of the coast in a situation such as this, the more recent source book takes precedence. Since Monster manual III was printed in August of 2004, and Libris Mortis was printed October 2004, The interpretation of Libris Mortis is what matters.