I am having issues with DMS data from one client disappearing and reappearing on another client number.  This all started a few years ago when I set up a new client using 99-9999999 to set up the DMS file.  Ever since then, their data moves around to other clients even though I now have their correct social security number entered.

How can I fix this?  I like DMS but it makes me fearful when data just moves around because I know one day, I won't find it.