Duplicate by Erman fails

[big]

Hi,
 on R12.2.13 and DB 19c on AIX

When duplicating by RMAN, it fails with following messages:



What do you advise?

Thanks and regards.

[ErmanArslansOracleBlog]

putting source PDBs in READ ONLY mode may solve this.

please also see ->

https://www.ludovicocaldara.net/dba/a-pdb-is-cloned-while-in-read-write-data-guard-loose-its-marbles-12-1-0-2-ora-19729/