...
The data in DATABASECHANGELOG and DATABASECHANGELOGLOCK tables must be copied from the source database to the target RefDb.
For multi-schema projects, the schema for these tables can be found by checking the datical.project file for the trackingSchema attribute on row 2.
For single schema projects the tables will be present in the managed schema.
Grants: Ensure any necessary grants are added to the RefDb.
ORACLE: In the event of server outage or unexpected shutdown which requires a restore refresh of the RefDb, check that no orphan datapump jobs remain on the server.
https://www.oracle-scripts.net/cleanup-orphaned-datapump-jobs
Orphan jobs may result in the following error during the restore operation of a Packager job:
Code Block ORA-06512: at "SYS.DBMS_DATAPUMP", line 7143 ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79 ORA-06512: at "SYS.DBMS_DATAPUMP", line 4932 ORA-06512: at "SYS.DBMS_DATAPUMP", line 7137
...