This is about the Magento extension called “DHL Intraship“. Here, version 0.1.9 was used in Magento 1.4.2.
An error message appeared like this:
Unable to create directory /var/www/vhosts/example.com/httpdocs/var/intraship/documents/pdf--4/pdf--49/
The solution for this is shown is shown in the Magento forums thread “Sendung erstellen: Unable to create directory var/intraship/pdf–…/pdf–…/“.