Problem with Currency Conversion of Labour costs in Maintenance Order

Hi All,

I have a problem where our Controlling Area currency is USD and Maintenance Order is created in EUR .. here the planned /Actual Labour costs in EUR are different tcode - IW32 , system is not taking the latest USD to EUR exchange rate than that maintained in OB08 , we normally update the TCURR Table once in 25days , we maintain the activity type fixed rates in KP26 with costs centers and use that acitvity types in Maintenance Order Operation ..,the cost in KP26 is in USD .. and cost center currency is in EUR .. now i would like to know why the system is not taking latest exchange rate for calculation of Planned and Actual labour costs .. in Maintenance Order.. , do i need to do any settings in CO for this ? does setting in OKEV ..are helpful ?

regrds

pushpa