While one person details the drawing, can someone else modify the assembly or components when using EPDM?

If I'm working on an assembly drawing and I find that the assembly or component parts need to be modified, is it possible to allow another person to check out those files and make the updates while I have the drawing checked out? So first of all, I would really like to know if it's even possible within the framework of EPDM.

If it is possible, does anyone know which settings we would need to change in EPDM? And even if I could change the settings to make it work, is it a bad idea? Is the drawing going to fall apart from broken references and basically be a waste of time? I hope somebody can shed a little light on this and let me know if it can be done. A co-worker assures me that it is impossible. I find that hard to believe.

Thanks.

SolidworksDrawings And Detailing