The interferences in BC Framer® software are from the edge of the intersecting wall and the exterior sheathing of the walls. The software is behaving as expected by reporting a non-critical interference between the two elements.
Eliminate the warning as follows, or simply ignore it:
- Turn on the visibility switch for the sheet zone (Object > Walls > Sheet Zone).
- Adjust the end of the wall so that it stops at the edge of the sheathing.