enabling Database Vault is complicated

Enabling Database Vault in a already running system can be laborious.

I recently tried to enable DV in a (copy of a ) production Oracle EBS DB.
The Documentation is pretty lear and easy:
https://docs.oracle.com/database/121/DVADM/getting_started.htm#DVADM002
But I fail at

BEGIN 
DVSYS.CONFIGURE_DV ( 
dvowner_uname => 'DBV_OWNER', 
dvacctmgr_uname => 'DBV_ACCTMGR'); 
END; 
/ 

with

ERROR at line 1: 
ORA-47500: Database Vault cannot be configured. 
ORA-06512: at "DVSYS.CONFIGURE_DV", line 23 
ORA-06512: at "DVSYS.CONFIGURE_DV", line 72 
ORA-06512: at line 2 

That's not very helpful and ORA-47500 suggests:

If this happens, deinstall and then reinstall Oracle Database Vault

Even after removal and re-installation, the symptoms still stay.

The problem here are some invalid objects in the database!

As it's unclear to my which objects are the problem, I asked Oracle.
Unfortunately the answer is not helping a lot:

It is possible that not all [objects] need to be valid before you can configure DV successfully but you definitely need to work on fixing these invalid object at this point because that is the reason for the error.
If this happens, deinstall and then reinstall Oracle Database Vault.

Of course the suggestion doesn't help, utlrp did not change anything.
As all the invalid objects doesn't belong to the DBA but some developed code, it will take some time until DV is enabled.

I don't have any solution right now than laborious wading through all invalid objects and fixing them.