Change the User Decision Action in Workflow

I have a User Decision step have Decision Text

1.Accept Invoice

2.Accept Final Invoice, Closing PO Lines

3.Reject Invoice

4. Display Account Info

Now the requirement is when user click on button 'Accept Final Invoice, Closing PO Lines' A POP message should display with 'YES' and 'NO'.When user clicks on 'Yes' button what ever the functionality is there for the button 'Accept Final Invoice, Closing PO Lines' it should work and if the User clicks on 'No' button what ever functionality for the button 'Accept Invoice' should work means it should navigate to the Accept Invoice functionality.

I had used Program Exit concept and created a class and in that i had AFTER_EXECUTION method and used the function 'POPUP_TO_CONFIRM' to display POP up message once the user clicks on button 'Accept Final Invoice, Closing PO Lines' by displaying 2 options 'YES' and 'NO'.

Now the problem is i need to change the user Decision after displaying the POP up message.

Is there any way i can change the USer Decision after the POP up message display

Thanks

Durga Prasanth