Edit PO Quantity Ordered Without Reversing Receipt of Invoice

Hello everyone,

I was wondering if it is possible to edit a PO quantity ordered in the lines tab without having to reverse the receipt of invoice. 

From everything I learned, I always thought we had to create a reverse receipt of invoice first, then update the PO and recreate a new receipt of invoice.

However, an employee says he clearly remembers the Sage reseller mentioning it was possible during a training session when we upgraded to the 2021 version.

We use Sage 2021 Premium. 

Can anyone shed some light on this please?

And thank you in advance!