Can't add event to enhanced view

Hi, experts

We have two dev system( both are CRM 7.0 ), and we transport all TR from the old dev to the new dev.

Then we found problem in the new dev system.

BT115H_SLSO/SOHOverView has been ehanced in old dev system, the enhanced class is ZL_BT115H_S_SOHOVERVIEW_IMPL.

But when we add event to the view in new dev system, the system warned that we try to modify the standard class CL_BT115H_S_SOHOVERVIEW_IMPL.

We thought that maybe some data missed when we transport TR.

We check the view BSPWDV_CMP_C_RPL and BSPWDV_EHSET_ASG, all data is OK.

Are there other views that maintain the assignment of enhanced classes?

Please help. Thanks.

Yang.