Purpose
This process is the classic method used to verify invoices:
Process Flow
You receive an invoice from the vendor referring to a purchase order and a goods receipt.
Entering a vendor invoice involves:
The last step is not compulsory. If there is no balance or if the variances are within the tolerance limits set, you can post the invoice immediately after entering the allocation data.
If the system cannot post the invoice, the item screen appears for you to check the list.

When you post directly without an item list, variances in individual items can cancel each other out.
Result
The posted invoice passes on information about payments to Financial Accounting.