Exchange rate picking different

HI Friends,

I am facing one issue, that is Doc.currency is 70 EUR. and Local currency is 3091 USD. there is big discrepency in between that two values , for that we are maintaining exchange rate type "M" on 18.11.2010 (100 EUR =136.11913 USD). But the system is picking up Eff exchange rate type 44.16 how this value is generating i don't understand (Document type is DD customer clearing) please help me to solve this issue as soon as possible.

Thanks & regards

Sagar.