Exchange rate problem

Dear Gurus,

Can any one tell me why the exchange rate is always picking up frm the currency table (even though we gave the exchange rate manually while booking and payment) while doing Bank Reconciliation statement.

Scenario.

Currency table(OB08) rate is 1 USD = INR 45

Booked the invoice at 45.11

Cleared the inv at 45.11

After generating the BRS(upto batch processing everything is fine) and while doing batch processing (SM35) we are getting struck at the FB05 screen as it says difference is too large to clear - ie is because system picks up the table rate(45).

We do not want the system to pickup the table rate(invoice is already cleared with a different rate)

Please help me solve the issue.

Thanks

Deepak