Hi all,
I was trying to correct a posted sales invoice following the steps in the link below:
https://docs.microsoft.com/en-us/dynamics-nav-app/sales-how-correct-cancel-sales-invoice
However, on my NAV I don't see to be able to see the Correct and Cancel buttons in my ribbon.

I have tried to add these buttons in from the customize ribbon option but it does not seem to appear.

After i click on "ok", the button still does not turn out and the following appears.

Appreciate any help provided.
Thanks!