A service user cannot be removed by the following steps:
- Go to CCP > Users, choose some user and click
CCP shows the following message:
Service User "User_Name" (ID XXXXXX) successfully scheduled for deletion
There was an APS service linked with this user, but most likely appropriate APS instance has been already removed.
Please contact Odin Technical Support and provide this KB article number in order to delete this user from OA DB.