Unable to give access/Permission to the Users

Hi All,

I need your help to fix this bug. I am trying to give access to the user for “Cancel and Amend” but I am failed to do that.
I have tried all the possible ways to give them access in Purchase Order for “Cancel and Amend”.
From my end, all access is given but as a result, the User is not able to do the particular task.

Help me out in this scenario.