Hello,
There are two situations to consider:
1. Credit Blocked Order with NO confirmed Schedule Lines - Open Order Value in FD33 should not be updated.
2. Credit Blocked Order with Confirmed Schedule Lines - Open Order Value in FD33 should be updated.
Now, in your case, if the Credit blocked Order still has confirmed Schedule lines then it is normal to see its value update in FD33.
Hope this clarifies,
Thanks,
Jignesh Mehta