Cleared billing documents can be canceled

Hi~everyone;

I refered to the note 1842573 - Cleared billing documents can be canceled

I created a routing 629, and copy the code in SAP Note 1870023

Now when i cancel a cleared billing document using vf11

a error message(VF193 TYPE E) show up, perfectly!

But, some billing document still can be saved with this error message

A reverse billing Document created

when error message vf193 show up, i hope it will not create the revers billing doc if i click save button.

thanks~