Usually a servicepack such as SP1 for Vault 2013 cotains all previous hotfixes.
However this applies only for global hotfixes (something which is fixed for all Vault languages).
Hotfixes which only applies to a specific localized Vault environment (such as German, English, French, Italian etc.) are usually not part of the a servicepack!
Esepecially this German hotfix Unable to invoke the Vault Log In dialog from Inventor Task Scheduler is not part of Vault 2013 SP1!
So if you experience the problem in German Task Scheduler which was described in the previous blog post after installing SP1 of Vault 2013 please make sure you apply this hotfix.