Application Container Relocation PDB opens in restricted mode.

Hi all,

I have a 19c running on Oracle Linux 8. I started learning about Oracle Application Containers, and all was going just fine until I tried to relocate one of my PDB from one database to another.

I used the relocate command:

CREATE PLUGGABLE DATABASE north_app_pdb FROM north_app_pdb@orclcdb_link RELOCATE;

Pluggable database created.

Then I opened it:

alter pluggable database north_app_pdb open;

Warning: PDB altered with errors.

Then I did:

select name,cause,message from pdb_plug_in_violations;

NORTH_APP_PDB  Application version's checksums mismatch for application SALES_APP.

But the app is synchronized with the PDB. There is nowhere on the internet or here in the oracle support that shows me how to troubleshoot this kind of message. So I need your help, dear gurus, to figure out how to fix this and how to troubleshoot a PDB opened in restricted mode?