Whether the National Treasury has measured the (a) advantages, (b) impact and/or (c) risk of preferential treatment built into the (i) National Treasury “practice note”, (ii) Preferential Procurement Policy Framework Act, Act 5 of 2000, and (iii) overall constitutionality of the black economic empowerment weighting for procurement purposes against Section 217 of the Constitution of the Republic of South Africa; if not, why not; if so, what are the relevant details?