Invoice Management -> Cancel button should be enabled when a user is only able to view the template details.

Steps:-
1] Log into the site using partner credentials
2] Search and select company which has an invoice created by SA login
3] Now on invoice management edit the invoice created by SA
4] Click on Cancel button and observe

Actual Result:-
On click of cancel button no action is performed.

Expected Result:-
On click of cancel button system should redirect the user to the Invoice Management screen.