Use R/3 DataSource for Multiple Master Data Targets

This is probably a simple question, but I am wondering if I am missing something. I have 2 InfoObjects in BW that I want to populate with MD attributes from an R/3 DataSource.

After I use the DataSource for one InfoObject, it is not longer available for use with the 2nd InfoObject - i.e. I don't see it on the drop-down list.

Is there a preferred method to use the R/3 for 2 InfoObjects for master data attributes?

Thanks.