rounding off diff

Dear Gurus,

Can some one tell me how the rounding for works.

Financial Accounting ->AR/AP->Business Transaction->Outgoing Payments->Define Account for Rounding off difference.

My client require the following scenario.

a. Client wanted to book all the invoies with decimals at liability booking(FB60).

Eg : 110.36 and 110.56

b. While making payment(F-53 or F-58) he waanted to round off the decimals(as he do not want to cut the cheque for decimals

Eg : 110 and 111

Please help me to configure to get the out put

Thanks

Deepak