Invoices linked to a purchase with status Planned are not shown as posted under Produced in the production code overview, even though they appear in the invoice tab. When you change the purchase to Purchased, the posted amount appears.
How to fix it
Open the purchase and select Edit.
Change Status to Purchased. If the purchase has several lines, use Set all.
Check that the amount matches what has actually been agreed.
Save.
Refresh the page if the change does not appear right away.
Why should the purchase be set to Purchased?
If invoices arrive on a purchase, it has in practice been ordered. The Purchased status gives an accurate picture of what is committed and what is invoiced, both on the production code and in Purchasing.