automatic upload of roles from BI to portal

Hi,

Which would be the options for creating an automatic upload of roles from BI to portal? Which would be the best option?

Instead of having to do it manually, e.g. system adminstration --> transports --> role upload --> manual load, I want the system to do this in batch.

We maintain the roles in BI abap and then do this uload to the portal (EP 7.0 SP15). I want the portal to update according to BI automatically as new users get new roles etc.

Thankkful for any input!

Regards,

Fredrik