Unit Cost calculation does not match out to Extended Cost

Hello,

My client is getting an error when importing PO into GP.  Unit cost calculation does not match out to extended cost.  A long time ago I got this error message it turned out it was because multicurrency was not registered.  So, I did not make the same mistake this time. 

They have been importing POs for serveral months.  Now all of sudden they are getting this error message when importing POs into GP they are on 2.0.0159 version with gp 2010. 

Thanks for you help.