I realize these words are not directly from the company and I am reading them through Google translate, but I do think they accurately reflect what makes these implementations work or not. If you are getting into SAP and "adapting it to your needs" then you will almost certainly fail.
Scenario: I am implementing SAP's invoice approval workflow in a company that already has an invoice approval workflow that a former CFO designed quickly after a problem a few years earlier. Its worked fine.
Companies who are successful implementing SAP: "I mean SAP's workflow makes sense, is already implemented, works for much larger companies, and has no bearing on our core business, so lets just switch to that.
Companies who fail at implementing SAP: "Lets hire some consultants to adapt SAP to our needs"
Source: I did process flows in preparation for SAP implementations in the late 2000s.