Hi,
1. Please make sure no body connected to B1 at branch office.
2. Note that you can increase decimal, but not possible to decrease the decimal places
Also refer SAP help file for decimal settings:
http://help.sap.com/saphelp_sbo900/helpdata/en/45/06b85a7d720487e10000000a155369/content.htm
Thanks & Regards,
Nagarajan