is being edited by and is exclusive to %0. You can check out this file but you will be unable to check in your changes until ...

'%1' is being edited by and is exclusive to %0.  You can check out this file but you will be unable to check in your changes until %0 checks in their version. Because Visual SourceSafe cannot merge two versions of a file of this type, your next checkin will overwrite %0's version. Do you want to continue?