Actually, I’d personally recommend against majoring in anything THAT specialized. Especially if your long-term objective is to get into IT project management.
If there’s one clear thing that the last 20 years have taught us, it’s that change has taken on a far more rapid pace than ever before in history.
With that in mind, what I’d suggest is that, while you can learn all about SAP, it should be within a framework of “How do I solve problem X?”. This means that you should be acquainted with areas of specialization that you don’t particularly care for – or those will a weak point for you. If you have enough weak points, they affect the shape of your hairstyle – if you get my drift.
Case in point – I took a year of accounting – I HATE accounting!! But – I understand its value and what it can and cannot be used for.
Project managers need to have an understanding of many different disciplines. Not to be able to do them, but to be able to know where they are appropriate or not, on track or not and such. Project management is an art/science unto itself.
Don’t become the kind of manager whose only tool is a hammer – that tends to make every problem resemble a nail.