I am using project to sketch to include an inter-part copy for a cutout. The "maintain associativity when projecting geometry from other parts in the assembly" box is greyed out so I cannot check it. I want to link the cutout but can't. Why is the box not checkable?
Good point @lking
I remember this in the context of Peers which does not allow interacting with a part unless activated.
Fortunately Solid Edge allows activating a part even after entering the sketch mode.
Hi @YD Credit goes to Bruce for pointing out the option. I haven't added new knowledge here
I believe @bshand has the answer.
If using "Project to Sketch in Synch mode, it cannot be associative so that option cannot be applied.
If using "Project to Sketch in an Ordered Sketch/Profile, it can be associative and then what the other said would be things to look at if it is not working there.
I have run into the same thing about 30 times. Can't remember what created the problem since I work completely in ordered. I have just developed habits that avoid the problem.
The limits I run into are not being able to project on a slope (say a hole axis is at 45 deg to the projection plane). The other limiting factor I run into is no way to repair includes. If the include was a line or a circle it can be repaired with relations, but if the geometry is any more complicated, include can't be repaired. Be careful to never lose the relation.