ESR - PVR - roundings [Swiss]

Hello,

we are beginning using this report in NAV 5.0 CH. I see that the amount are 
always rounded to the 5 cts. 
If I print an invoice where there are not roundings the two amounts (the one 
of the invoice and the one of the pvr) are differents.
These amounts in PVR are calculated in functions in codeunit  11503 - CHMgt 
but I don't know if it is a law to round or if it is changeable or if it 
depends by bank.
Do you know something about?

Thank you