Hi Nathalie,
The step FBICA2 is for automatic assingment of the documents that are selected.
Which documents you want to bring into for reconciliation is all dependent upon the selection ledger rule you have defined.
Basically process 002 is for GL accounts which are not maintained for Open item Management(OIM).
May be if you try to define your own rule you will be able to omit the BS accounts.
The rule i have mentioned earlier is what we have been using.
Regards,
Ravi
P.S. Please mark all the answers as "correct" which were helpful to you.Thanks 