Same Username, diferent Domain...

Hello I have SD+ v6008 installed and I detect a problem with my environment.
I have 4 diferent domains in my forest (Win2003) and I have some user that by coincidence, have that same username ex:

DOMAIN1\asantos (Anabela Santos)
DOMAIN2\asantos (Alice Santos)

And when the "import requesters from AD' is activated, the data of the requester user from the first domain is overwriten by the second one.

Then the first user (requester) cannot login in sd+ to open a problem (for ex.)

Is there anyway that I can override this? I tried to edit user's login to DOMAIN1\xxxxx but when I restore a backup it adds me another "\".... making this option unusable. (DOMAIN1\\\\xxxxx adds one slash every backup/restore)

Thanks in advance