When using a punch-out catalogue PR creators are logged into the suppliers portal using the mediusflow login in essence ... it doesn't tell the supplier which user from MF is logging in... some suppliers need to know which user is accessing thier catalogue so they can restrict what items they can see and update allocated 'budgets' - for instance when ordering uniforms user A might be able to buy shoes and shirts up to $1000 in a year, but user B might be able to buy raincoats, boots, hardhats up to $500 per year... essentially allowing supplier to apply the correct buying permissions and track purchasing person.