Purchase order mass approval page

Hello,

When I approve a PO via Approve POs page (Purchasing > Purchase Orders > Approve POs), the purchase order is never approved.

Here are my steps :

1. I create a PO and submit it for approval

2. The approver goes in Approve POs page and selects the "Approve" option for the PO and then clicks on "Submit"

3. The PO gets out of the list, but in fact is never approved.

Should I launch a process for the submission to work ? Is there an option to activate ?

Thank you in advance for your answer.

Regards,

Badir