What are the options for the automatic posting of unplanned additional costs when posting an invoice with a purchase order reference? (Select all that apply)

The option stating that the system automatically determines the valid WE/RE (Goods Receipt/Invoice Receipt) account is correct because it reflects how the system processes transactions related to purchase orders. When an invoice is posted against a purchase order, the system utilizes predefined accounting settings to identify the appropriate accounts to handle any unplanned additional costs. This ensures that the financial records remain accurate and consistent, as these costs must be properly accounted for in the ledgers.

In the context of the other options, the role of the system in handling additional costs involves various approaches, such as distributing those costs and allowing adjustments, which aren’t captured solely by determining the WE/RE accounts. The correct accounting treatment for unplanned costs ensures clarity in financial reporting, while the other choices provide scenarios that may not fully reflect the system's automation capabilities or may imply processes requiring manual intervention or adjustments that could complicate the posting process.