There are many companies where sales people are located far away from the corporate office where the HR team exists and this makes management of sales people a difficult job as far as the HR team is concerned. Sales departments have often found to handle all the personnel related problems on their own and the HR team mainly acts in an advisory capacity.
The HR team who are the specialists in job analysis, recruiting, selection, training and motivation are often consulted by sales executives at various junctures. The two departments have often been found to jointly formulate pension policies, vacation policies, sick leaves, health checks etc.