Employee: (start missing something) user Specify the need script Check if goods are in stock Goods in stock? Yes Officer: user Approve good allocation Employee: manual Use goods from stock ... Goods in stock? No user Create purchase requisition Officer: user Approve purchase requisition Central procurement: user Check purchase requisition Supplier known? Yes script Create order from purchase requisition ... ... Supplier known? No (publish offer request) (receive offer) user Select a supplier script Create supplier in ERP | (send notification) script Create order from purchase requisition Officer: user Sign order Central procurement: send order Warehouse: manual Wait for order delivery (timer no delivery in 1 month) Central procurement: user Contact supplier manual Wait for order delivery ... ... Warehouse: manual Wait for order delivery (receive delivery of goods) Unpack shipment Central procurement: user Check quantity and quality Employee: Use newly delivered goods Supplier: (notify offer request) user Prepare offer (send offer) (receive notification) (receive order) manual Produce goods (send delivery of goods)