Upgraded 11.2.0.4 to 19c

Dear Experts,

We are upgrading 11g database to 19c database. 11g is non-cdb and 19c is multitenant.

CDB -> sssebscr

PDB->SSSEBSTR

Upgrade is completed. As part of the upgrade we are converting database to Multitenant Architecture. We are following doc ID: 2552181.1. 

We are checking for PDB violation. Can you please suggest what action can be taken here?

NAME       CAUSE                TYPE       STATUS
---------- -------------------- ---------- ----------
MESSAGE

SSSEBSTR   Service Name Conflict WARNING    PENDING
           
Service name or network name of service SSSEBSCR in the PDB is invalid or conflicts with an existing service name or network name in the CDB.

Thanks,
SG