When you delete a service account, the user name, password, or local-user to remote-user mapping data that the service account contains is also deleted.
See Editing Business Service Configurations or Editing Proxy Service Configurations.
The service account is deleted in the current session. If a business service or proxy service has been configured to use a service account, a Deletion Warning icon indicates that you can delete the service account with a warning confirmation. This might result in conflicts due to unresolved references from the service to the deleted service account.