As many of us sometimes i offer some ingame credit for a referal click. Never was a problem i always got my 600 CC till yesterday when i got only 100 CC. Any idea?

It should still be the original amount, as far as the swtor Frield Referral site says. But the referrals I have received recently are a mix of 100, 500 and 600 CC grants, all listed under the same "Friends Referral Grant" title.

It might be someone who's already used that link once before. I think if it's a brand new sub you get 500cc but if their sub runs out and they use the same link again its only 100cc. Not entirely sure on this, just a theory I've heard of.