You cannot post a supplier invoice for material items. You are asked to enter accounting information like a cost center or a GL account. However you entered a product category ID already for accounting purposes.
In the profitability reports, you do not want the materials to be assigned to a cost center or GL account. You want the materials to be assigned to the product categories IDs.
Reproducing the Issue
1. Go to the Supplier Invoicing work center.
2. Select the New Invoice Without Purchase Order link under the Common Tasks section.
3. Enter material items with product category IDs and all remaining mandatory info.
4. Press Check. You get an error such as: Item 1: Accounting data missing.
This is possible to create such invoices without account assignment (cost distribution). However this is only possible when the invoice is a follow-up document of a purchase orders with to-stock materials. In this case, you will find a reference to an inbound delivery in the Cost Distribution subtab of the Items tab.
Refrain from creating invoices from scratch for to-stock material items. Otherwise, enter a cost center or GL account.
KBA , AP-SIP , Supplier Invoice Processing , How To