Well, it happens when you put race before performance. 
Exclusion and inclusion because of race opens the door to nefarious tender awards. Not to mention the doubt it creates over the level of competency of black business. They will always have 'thery're BBBEE' tags attached so will be discarded on really serious projects thereby stunting their long term progress. 
Racial criteria are the root of all our ills. It is short sighted.  Ditch it for SMME's or make it purely education based. It can be a 'white tax' on business to commit a percentage of profit to the education of the black population.