SAP Standard modified objects to bring back older version after upgrade

Hi All,

We have recently upgraded from 4.7EE to MySAP 5.0. In 4.7 EE there are some of the SAP standard objects we had modified.When tried to activate the earlier version of the objects after upgrade using SPAU it is not allowing me to do so.What I have to be done to activate earlier version of the SAP standard objects to activate.Can one have any idea?. Thanks in advance.

Regards,

Ameer.