As reported in V6b1 there are issues with using constraints to PE cuts in the Draw box designer. Steps to repeat:
CE main
Select Draw box designer
open standard draw box
Const Sett>>global change material to 16mm Horizon
Change method to full dado, depth.3
select OK allow to refresh
Const sett>>back change bottom inset to .5, change dado depth to .25
select OK allow to refresh
pan to make back visible, select, take back to DBPE
place rectangle over each lower corner, apply cut thru to geometry, select main, apply cuts
select back again, take to CM
in CM set Horizontal to .5 on both cutouts, set vertical to 1.313 on both
Top (page view top) cut lowers outside of part instead of raising cutout see below:
You can see that the dado rectangle is still at its original height, but the side height has been reduced.
When these settings, even tho erroneous, are accepted, refresh throws DBE to my other monitor and sets the drawer to look like this:



