Satellite Server upgrade from version 6.12 to version 6.13 fails with the error - Can't set target version 6.13, 6.12 already in progress

Issue

• Why does Red Hat Satellite upgrade from 6.12 to 6.13 fail with the following error?

  Nothing to update, can't find new version of satellite-maintain.
  Can't set target version 6.13, 6.12 already in progress