Filter Drupal view by value of field?

I am working with Drupal 6.x with Views and CCK to make some simple forms.  I want to have a field in one CCK type / content type reference a node from another CCK type.  However, I only want the list of possible references to be included if the value in another field is equal to X.  Specifically I have CCK type "A".  "B" will have a field that references the title / nid of "A".  The user will select from a menu list.  However, I only want the user to be able to select / reference "A" in "B" if another field in "A" has a certain status.  In my specific case there is an approval field in "A".  I only want a user in "B" to be able to reference an "A" entry if the "A" field for approval status is set to "Approved".  Is there a way to do this with native CCK or Views functionality, or alternatively is there a module for 6.x I can use.  Or am I looking at learning how to hook forms?