I had evolved in a solution for this issue. The tablespaces must have ae_data and ae_index names and the schema must be created under AE DB connection.
I have received another message the first time I executed the DB Load (U00003539 UCUDB - DB Check: Error in rollback), that I must investigate.
Running the DB Load via command line twice, apparently solve the issue, but I'll try other options to make sure that the database is consistent:
1 (first time): UCYBDBld -B -X<path >\UC_UPD.TXT
2 (second time): UCYBDBld -B -TNO -K<your key>
Any news will be posted. Good luck !