Hi,
When using SCCM (SUP) to update clients you don't need to configure WSUS (just install it) and you must disabled the GPO for the WSUS if still exist because the ConfigMgr client applies a local GPO that can be create a conflict with GPO of WSUS ...
For more information :
http://www.windows-noob.com/forums/index.php?/forum/66-software-update-point/Thank's
Bechir Gharbi. MCSA, MCSE M+S, MCITP Server/Enterprise Administrator, MCT, MCTS ConfigMgr