BEEF???? Solange Appears To Be Taking SUBLIMINAL SHOTS At Her Sister . . . BEYONCE . . . OVER TWITTER!!!

SOLANGE KNOWLES was less than happy about the credit that she received on Beyonce's new DVD release - of her 4 concert series.

Well this may just be a coincidence . . . but Solo left some pretty SCATHING Tweets, calling someone a"thief"

Awww shEEEEEt!!!!