Hi Gero,
Here is a link to info on PSLE: http://service.sap.com/psle
Here's a document on Enterprise Support: https://support.sap.com/content/dam/library/SAP%20Support%20Portal/support-programs-services/support-programs/enterprise…
You can also find more information on support programs here: Support Programs | SAP Support Portal
Hope that helps!
Kristen
