DynamicValue in WorkFlow Manager

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C#

service

hi
DynamicValues are used in the workflow manager 1.0.for using dynamicvalue in workflow , i want to reference microsoft.activities dll. i can pass dynamicvalue as a input from the client and get from the workflow to client.the problem i'm facing is , i used dynamicvalue in Restservices in webapi. i can refer the dll and i can use the dynamicvalue.in my workflow i have two services. when i passed dynamicvalue like below to one workflow as a inargument of one service ,i'm getting the

DynamicValue attriAmt = "true";
    DynamicValue inputno = new DynamicValue();
     inputno.Add("attriAmt", attriAmt);

Dynamicvalue in that service and i can return back the value from service to workflow.the result dynamicvalue i'm passing to second service but i'm getting only key its value become null..i don't know why its happend ...the resulting dynamicvalue i'm getting in second service like this

("attriAmt", null)

pls explain why its happening..?