Do you use posting proposals? 

In Aurena, a new invoice is created in New Manual Supplier Invoice and there you can select the LOV button for the PO receipts.

If you use the posting proposals, then changing the PO reference can only be done in the Posting Proposal window rather than in the Manual Supplier Invoice window.

Hi, 

If this is a posting proposal company you will only have the LOV enabled from the Posting Proposal page. 

Best regards, 

Linda

Functionality is such if posting proposal is enabled under invoice tab in the respective company

First you will have to click on the posting proposal button on the MSI

Inside posting proposal page you will be able to view the LOV 

Best Regards,

Rashen

Hello Everyone,

Thank you very much for your assistance on this topic.

Kind regards,

Shanuka.