In my opinion key step of integrate, the production fulfillment and procurement processes, that is integration. Single integrated process from 3 is 1. For example, in receiving orders from customers, sales orders from customers and require buy send the quotation to customers when the customer agreed sales will send needs of customers to the warehouse to the picking by warehouse manager to check out. Warehouse have enough goods or if the goods not only have to send to the production department to produce adequate to the needs of customers.
And have made a picking list to bring a product to the process, packing, and delivery. The first shipment procedures that accounting need to send invoices to customers and to get Receive payment from clients to the delivery.
However, if the production has not enough raw materials production need to send an order to buy the object to be used in the production.