This issue could be due to a couple of reasons:
After approval, enter details of the invoice. Once details are added and the transaction saved, the invoice will then be posted to the Purchase Ledger batch.
1. Check the configuration of the Invoice Register (if you have sufficient access rights) as it may be set to require approval:
Using Ribbon style navigation:
Select System, Options, Invoice Register Options
Select PL Approval and or POP Approval.
Using Classic/Module Menus style navigation:
Select System Control, Options, Invoice Register Options
Select PL Approval and or POP Approval.
2. Check if the Invoice has not been matched to an order:
Select Creditors, Match, Match Order
Select Display
If the Invoice appears in this list it has not been matched to an order.
If the above does not answer your query, please raise a new case online and reference the title of this article.