
The figure shows business transactions that establish a connection to work breakdown structure (WBS) elements or activities via an assignment. By assigning the appropriate documents, the commitment or actual costs can be posted directly to a WBS element, network, activity, or activity element.
During the project planning phase, you can plan the costs for purchase requisitions, purchase orders, and goods receipts at the network or activity level using externally processed activities, service activities, or material components that are procured directly. Using internally processed activities, you can withdraw stock from the warehouse, post invoices using cost activities, and post costs arising as a result of confirmations.
Actual costs arising from purchase requisitions, purchase orders, goods receipts, or activity allocations are compared with planned costs from primary cost planning or activity input planning data for the network.