Earlier quoted context omitted.
The GDPR applies to all companies, social network platforms or not. It's not even about the internet in particular, it's about how companies can store and process private information of EU citizens.
SAP is B2B, the vast majoritybof personal data is professional (supplier and customer business contacts) and emoloyee data (payroll and such). Not much to fine here. Also, since SAP as a company isn't handling any of that data, SAP isn't really affected.
I am not sure that is completely correct, considering SAP's cloud offerings.