changing the bank recon setup

Hi,

we have to change one of the Account symbol and asociated account for the posting rules for electronic bank statements.

what other places do I need to make changes along with this..?

do routing to a different account affects the auto reconciliation..?

I would like to understand how the auto recon works in SAP..? after we set up all configurations like trans. types, posting rules, external transaction codes etc..

when we process the AUSZUG1 and UMSATZ1 files what all processes happens ?

thanks & reagrds