BP Account Balance for customer not matched with Trial balance Report

Dear sir,

BP Account Balance for customer not matched with Trial balance

Report.In Business partner master data window it shown

account balance 0.03 But i check with trial balance report(Account

balance) for particular customer it shown 0.00 correctly.

Pl tell me why Business partner master data window Account balance

shown 0.03

Regards

Jambulingam.P