Modified SAP SWCV and CR Content Upgrade

Hello Experts,

I am reviewing an existing XI installation and found that the developers added interfaces and other design objects to standard SAP SWCVs like BW and R/3 instead of creating a project SWCV to put their objects in.

The question is, if we update the CR Content in the SLD would these developments residing in the SAP SWCVs be affected? and what would be the consequences to them?

Thanks in advance for your answers.

-Sam.