If you are upgrading from 4.6c to ECC 6.0 AND are moving to BASIS SP12, you will have problems in the PARCONV_UPG phase of the upgrade. SAP recommends that you not upgrade to BASIS SP12, but rather go to that SP level either before or after the upgrade. If you are in the middle of the upgrade, then you must implement the corrections referenced in the following two notes: 1069463 and 1042435. In 1069463 you simply run a script that creates some database objects that the upgrade phase needs in order to complete, and note 1042435 is a set of changes that R3Trans.exe makes using a data file that you download.
Good Luck!
