In URT the following ORA error can be seen:
Starting "UPDATEDLP"."SYS_IMPORT_FULL_01": UPDATEDLP/********@DLPTST dumpfile=sandbox.dmp remap_schema=DLP_USER:UPDATEDLP directory=data_pump_dir logfile=imp_sandbox.log transform=oid:n exclude=STATISTICS
ORA-39346: data loss in character set conversion for object PACKAGE_BODY:"UPDATEDLP"."UPGRADESCHEMA_DATA_MIGRATION"
Upgrade Target Version: DLP 15.x and 16.x
Readiness Tool Version: 2 and higher
Database Schema Version: All
ORA-39346 and ORA-39383 are occurring during stage 1, and these objects will be rebuilt during a later stage.
No further action is required.