Data dictionary difference after upgrade

Hi,

After the upgrade from SAP R/3 4.6c to ECC 6.0, many checks are done, and when now we compare the DD of cluster table BSEG, we have the new version of ECC, and we have all missing fields added as customizing, I've check the log of the upgrade, but nothing where the system is looking for the request when the update is done, have you a idea about this ?