Update currency field using Soap update

Hi ,

I want to update currency field actual value in opportunity entity. But it does not update. I have tried below solutions

 <c:value i:type=\"d:decimal\" xmlns:d=\"http://www.w3.org/2001/XMLSchema\">" +parseFloat(eval(actualrevenue)) + "</c:value>"   

  (Update operation sucessfull, but currency field does not update)

 <c:value i:type=\"d:decimal\" xmlns:d=\"http://www.w3.org/2001/XMLSchema\">" +eval(actualrevenue) + "</c:value>"   

  (Update operation sucessfull, but currency field does not update)

 <c:value i:type=\"d:string\" xmlns:d=\"http://www.w3.org/2001/XMLSchema\">" +actualrevenue+ "</c:value>"    

(Update operation sucessfull, but currency field does not update)

 <c:value i:type=\"d:money\" xmlns:d=\"http://www.w3.org/2001/XMLSchema\">" +actualrevenue+ "</c:value>"  

   (Getting error "The deserializer has no knowledge of any type that maps to this name. Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value for name 'money'")

 <c:value i:type=\"d:Money\" xmlns:d=\"http://www.w3.org/2001/XMLSchema\">" +actualrevenue + "</c:value>"    

(Getting error "The deserializer has no knowledge of any type that maps to this name. Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value for name 'M

Can any one please guide me , how to update currency field.

Thanks,

---vaib