Procurement Dept is more on suppliers relationship, pricing and competitors activities monitoring. Though it also oversees the quality of the raw materials being purchased, still QA/QC will check the quality of raw materials the PD delivered to the site.
From Post2 I deduce that from a quality POV, your QA authorises whether a Supplier may be placed on the Approved Supplier's List before starting a routine supply? ie similar to post7.
It is not unknown IMEX of some Companies for the Managing Director to have the final vote. Where the "buck" literally stops.Go to the full post