How do I assign new storage for poly~ with sfplay~ and record~ in different patchers by a single command in the main patch?

In a patch I use 2 patchers with poly~ and record~. To flexibely assign new file storage for multiple successive recordings and playbacks I need a possibility to send a single command from the main patch in all patchers. preferably creating new filenames remotely. But when I send e.g. open… .wav some error message occurs.

I am grateful for a hint.