Update control report did not appear

Dear Experts/Gurus,

I am confusing after upgrade database version 2004A SP 00 PL 41 to SBO 2005A SP 01 PL 29, the update control report did not appear but when I upgrade database SBO 2004A SP 00 from PL 20 to PL 41, it appears after logon. Why could it be happened ? I appreciate your answer. TIA

Rgds,

Steve

"ratify kyoto protocol"