PRGZ-01103
The source database "{0}" is a pluggable database existing in the multitenant container database "{1}".
Cause
An attempt to convert a nonmultitenant container database (CDB) to a pluggable database (PDB) was rejected because the specified source database was a PDB existing in the indicated CDB.
Action
Ensure that the specified source database is not a PDB in any CDB and then retry the operation.