The modern concept of doing business requires every company that wants to be successful to have connected and integrated operations with other companies. The concept of the supply chain enables efficient integration of all included members to fulfil customer demand. An essential element in overcoming business challenges is purchasing, the primary purpose of which is to provide the company with the optimal quantities of goods necessary for smooth and effective functioning. The fundamental goal of the present paper is to draw attention to the importance of effective purchasing operations – with an emphasis on the spare parts business – through mapping business processes. Doing so, it would become apparent to the management of firms how to enhance information flow, and improve process visibility, hence getting a better understanding of the need to improve the efficiency and sustainability of purchasing processes.