Invoices in PDF format have to pass a plausibility check before approval. This ensures that faulty invoices don’t get approved.
To check, open the invoice and verify if the indicated invoice amount matches the assigned pay rate for the invoiced assignment(s). To do so, put the invoice amount from the PDF in the dedicated field.
If the amounts match, you can confirm and approve the invoice
If the invoiced amount is too low, you have to decline the invoice
If the amount is too high, you can either decline or edit the invoice